View source for Texas State Highway Loop 1

{{short description|Highway in Texas}}
{{Use American English|date=April 2025}}
{{Use mdy dates|date=September 2019}}
{{Confuse|Texas State Highway 1}}
{{Infobox road
|state=TX
|type=Loop Dual
|route=1
|alternate_name=MoPac Expressway
|map={{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=240|type=line|raw={{Wikipedia:Map data/Wikipedia KML/Texas State Highway Loop 1}}}}
|map_custom=yes
|map_notes=Loop 1 highlighted in red
|length_mi=25.698
|length_ref=<ref name="Loop 1">{{TxDOT|SL|1|access-date= March 24, 2013}}</ref>
|established=1967
|direction_a=South
|terminus_a={{jct|state=TX|SH|45}}
|junction={{plainlist|
*{{jct|state=TX|US|290}}
*{{jct|state=TX|SH|71}}
*{{jct|state=TX|US|183}}
}}
|direction_b=North
|terminus_b={{jct|state=TX|Toll|45}}
|counties=[[Travis County, Texas|Travis]], [[Williamson County, Texas|Williamson]]
|previous_type=SH-old
|previous_route=1
|next_type=FM
|next_route=1
}}

'''Loop 1''' is a [[controlled-access highway|freeway]] that provides access to the west side of [[Austin, Texas|Austin]] in the U.S. state of [[Texas]]. It is named '''Mopac Expressway''' (or, according to some highway signs, '''Mopac Boulevard''') after the [[Missouri Pacific Railroad]] (or "MoPac"). Local residents almost always use the name "MoPac" rather than calling the road by its number,<ref>{{cite web |url=http://austin.about.com/od/gettingaroundaustin/a/StreetNames.htm |title=Confusing Road Names in Austin |access-date=January 2, 2012 |archive-url=https://web.archive.org/web/20111025024811/http://austin.about.com/od/gettingaroundaustin/a/StreetNames.htm |archive-date=October 25, 2011 |url-status=live}}</ref><ref>{{cite web |url=http://news.travel.aol.com/2010/08/26/austin-slang/ |title=Austin Slang - AOL Travel News |access-date=January 2, 2012 |archive-url=https://web.archive.org/web/20120120201434/http://news.travel.aol.com/2010/08/26/austin-slang |archive-date=January 20, 2012 |url-status=live}}</ref> which can cause much confusion, for few signs along the road use this name.<ref>{{cite web |url=http://www.alwaysaustin.com/2011/04/deciphering-austin-street-names/?doing_wp_cron=1325493261 |title=Decipher Austin streets &#124; Always Austin |access-date=January 2, 2012 |archive-url=https://web.archive.org/web/20120426085507/http://www.alwaysaustin.com/2011/04/deciphering-austin-street-names/?doing_wp_cron=1325493261 |archive-date=April 26, 2012 |url-status=live}}</ref><ref>{{cite web |url=http://www.yelp.com/topic/austin-mopac-expressway-just-wondering |title=MoPac Expressway. Just wondering &#124; Austin &#124; Yelp |access-date=January 2, 2012 |archive-url=https://web.archive.org/web/20160304035005/http://www.yelp.com/topic/austin-mopac-expressway-just-wondering |archive-date=March 4, 2016 |url-status=live}}</ref>

The original section of the highway was built in the 1970s along the [[right-of-way (railroad)|right-of-way]] of the Missouri Pacific Railroad (now owned by [[Union Pacific Railroad|Union Pacific]]), with the railroad tracks running in the highway [[Central reservation|median]] between West 8th Street and Northland Drive. To the north, the tracks run along the east side of newer sections of the highway from Northland Drive to Braker Lane.

==History==
{{see also|List of state highway spurs in Texas (1–99)#Spur 1{{!}}Texas State Highway Spur 1}}
===Route designation===
The first mention of Loop&nbsp;1 in public record was in 1929. In 1944, the City of Austin Planning Commission (CMAC) proposed that the highway be built in parts of the under-utilized right of way owned by the MoPac Railroad. Thus, the highway was eventually given the nickname "MoPac" for its proximity to the railroad. The current Loop&nbsp;1 was designated on October 27, 1967, from [[U.S. Highway 290 in Texas|US&nbsp;290]] northward to [[Farm to Market Road&nbsp;1325]] (FM&nbsp;1325).<ref name="statesman1967">{{cite news|title=Proposed MoPac Boulevard Is Designated as Loop No. 1|work=Austin Statesman|date=October 31, 1967|id={{ProQuest|1515952796}}}} {{subscription required}}</ref> On October 24, 1985, the designation was extended southward from US&nbsp;290 to SH&nbsp;45.<ref name="Loop 1"/>

===Expressway construction (1969 to 2006)===
This table contains the dates of the construction of segments of the road.<ref>{{cite web |url=http://www.mopacexpress.com/documents/Draft%20EA/Chapter%201%20Introduction.pdf |title=Introduction: Mopac Improvement Project, April 2012 |access-date=April 1, 2012}}</ref><ref>{{cite web |url=http://www.centraltexasturnpike.org/loop1/ |title=The MoPac 1 Project will study feasibility of managed lanes for Loop&nbsp;1, and included in the Mobility 2030 Plan that was adopted by CAMPO in June 2005 |access-date=June 1, 2005 |url-status=dead |archive-url=https://web.archive.org/web/20060223004217/http://www.centraltexasturnpike.org/loop1/ |archive-date=February 23, 2006}}</ref><ref>{{cite web |title=What Native American tribe was most common in the area? |publisher=Texas Department of Transportation |url=http://www.txdot.gov/project_information/projects/austin/mopac1/history.htm |access-date=January 24, 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100507190843/http://www.txdot.gov/project_information/projects/austin/mopac1/history.htm |archive-date=May 7, 2010}}</ref>

{| class="wikitable sortable" 
|-
! class="unsortable"| From
! class="unsortable"| To
! Length<br />(mi)
! Length<br />(km)
! Project<br />start
! Project<br />completion
! class="unsortable"| Notes
|-
| RM 2244 <br />(Bee Cave Road)
| RM 2222 <br />(Northland Road)
| {{convert|5.4|mi|km|disp=table}}
| align=center|February 1969 
| align=center|November 1975 
| align=center|Loop 1 project started with <br />construction of the 45th Street <br />Interchange in February 1969.
|-
| RM 2222 
| [[U.S. Highway 183 (Texas)|US 183]]
| {{convert|4.6|mi|km|disp=table}}
| align=center|September 1977
| align=center|June 1981 
| align=center|Northern terminus of Loop 1 completed, <br />until July 1989 - with construction of the [[freeway]] extension to FM 734.
|-
| RM&nbsp;2244
| [[Texas State Highway Loop 360|Loop&nbsp;360]]
| {{convert|1.9|mi|km|disp=table}}
| align=center|January 1979
| align=center|March 1982 
| align=center|Southern terminus of Loop 1 completed, <br />until October 1989 - with construction of the [[freeway]] extension to US 290.
|-
| Loop&nbsp;360
| US 290
| {{convert|1.6|mi|km|disp=table}}
| align=center|October 1983
| align=center|October 1989
| align=center|Southern terminus of Loop 1 completed, <br />until November 1990 - with construction of the roadway  <br />extension to Slaughter Lane. 
|-
| US 183
| FM&nbsp;1325 (Burnet Road) <br />and FM&nbsp;734 (Parmer Lane)
| {{convert|3.7|mi|km|disp=table}}
| align=center|January 1986
| align=center|July 1989
| align=center|Northern terminus of Loop 1 completed, <br />until October 2006 - with construction of the [[State Highway 45 (Texas)|SH 45 North]]/ <br />Loop 1 Connector [[toll road]]. <br />[[Stack interchange]] at US 183 is constructed - <br />involved major [[freeway]] improvements between Steck Avenue and US 183, <br />from March 1987 to June 1992.
|-
| [[U.S. Highway 290 (Texas)|US 290]]
| Slaughter Lane
| {{convert|3.6|mi|km|disp=table}}
| align=center|January 1988
| align=center|November 1990
| align=center|Southern terminus of Loop 1 completed, <br />until July 1991 - with construction of the roadway  <br />extension to La Crosse Avenue.
|-
| Slaughter Lane
| La Crosse Avenue
| {{convert|1.0|mi|km|disp=table}}
| align=center|July 1989
| align=center|July 1991
| align=center|Southern terminus of Loop 1 completed, <br />until May 1994 - with construction of the roadway  <br />extension to  [[State Highway 45 (Texas)|State Highway 45]] .
|-
| La Crosse Avenue
| SH 45
| {{convert|2.5|mi|km|disp=table}}
| align=center|November 1989
| align=center|May 1994
| align=center|Southern terminus of Loop 1 completed.
|-
| FM 734
| SH 45 North/ <br />Loop 1 Interchange
| {{convert|4.0|mi|km|disp=table}}
| align=center|February 2003
| align=center|October 2006
| align=center|Construction on the SH 45 North Interchange <br />began in September 2003. <br />Northern terminus of Loop 1 completed.
|}

==Route description==
[[Image:Mopac Expressway.jpg|right|thumb|A stretch of Loop 1 over the Hancock Drive bridge, looking north-northwest. The Union Pacific railway is visible in the foreground.]]
Loop 1's southern terminus is at the beginning of the [[State Highway 45 (Texas)|State Highway 45]] stub south of Austin. It passes through the [[Circle C Ranch]] housing development and the [[Edwards Aquifer]] and intersects [[State Highway 71 (Texas)|SH 71]]/[[U.S. Highway 290 (Texas)|US 290]] (Ben White Boulevard) and [[State Highway Loop 360 (Texas)|Loop 360]] (Capital of Texas Highway). It crosses the [[Colorado River (Texas)|Colorado River]] near downtown Austin; the view of the [[Texas State Capitol]] from the bridge became one of the [[Texas Capitol View Corridors|Capitol View Corridors]] protected under state and local law from obstruction by tall buildings in 1983.<ref>{{cite web |title=Downtown Development and Capitol View Corridors |publisher=Downtown Austin Commission |date=June 27, 2007 |url=https://icma.org/sites/default/files/301744_Downtown%20Development%20Comission%20Report.pdf |access-date=November 10, 2017 |archive-url=https://web.archive.org/web/20171115015410/https://icma.org/sites/default/files/301744_Downtown%20Development%20Comission%20Report.pdf |archive-date=November 15, 2017 |url-status=live}}</ref> North of the river, the highway runs parallel to the [[Balcones Fault]] and the [[Missouri-Pacific Railroad]] (Union Pacific) before it intersects [[U.S. Highway 183 (Texas)|US 183]] (Research Boulevard) northwest of downtown. Loop 1 travels concurrently with Farm to Market Road 1325 for several miles before the non-tolled freeway ends at Parmer Lane, spanning a distance of {{convert|22.061|mi|km}}.

Loop&nbsp;1 is designated a scenic roadway by the City of Austin.<ref name="Austin Code 25-10-7">{{cite web|title=Code of Ordinances § 25-10-7|url=https://library.municode.com/tx/austin/codes/code_of_ordinances?nodeId=TIT25LADE_CH25-10SIRE_ART1GEPR_S25-10-7SCRODE|publisher=City of Austin|via=Municode|access-date=October 28, 2022}}</ref>

=== Major construction projects ===

==== Loop 1 Toll ====
North of Parmer Lane, Loop 1 continues as a limited-access [[toll road]] to the [[State Highway 45 (Texas)|SH 45 North]]/Loop 1 interchange, spanning {{convert|3|mi|km}}. Frontage roads flank either side of the toll road to Merrilltown Drive.

The [[TxDOT|Texas Department of Transportation]] completed construction of the tollway as part of the [[Central Texas Turnpike Project|2002 Central Texas Turnpike Project (CTTP)]]. [[State Highway 45 (Texas)|SH 45 North]], also part of the project, provides freeway access to [[Interstate 35 (Texas)|Interstate 35]] from Loop 1. The 2002 CTTP was scheduled to be completed in September 2007. However, certain sections of the project, including Loop 1 opened early and more than $100 million under budget.

If and when [[State Highway 45 (Texas)|SH 45]] is completed to the south of Austin between [[FM 1626]] and [[Interstate 35 in Texas|I-35]], Loop 1 will effectively serve as a full western loop to the city, being directly connected to SH 45 (and indirectly to I-35) at both ends.

====MoPac Improvement Project====
{{Infobox road small
|state=TX
|type=Loop-Express
|route=1
|alternate_name=Mopac Improvement Project
|location=[[Austin, Texas|Austin]]
|formed=2017
}}
Since 1994, TxDOT has proposed the addition of [[managed lanes]] to portions of Loop 1. The MoPac Improvement Project<ref>{{cite web |url=http://www.mopacexpress.com/ |title=MoPac Improvement Project |access-date=February 19, 2011 |archive-url=https://web.archive.org/web/20101230191041/http://www.mopacexpress.com/ |archive-date=December 30, 2010 |url-status=live}}</ref> was relaunched in July 2010 by the [[Central Texas Regional Mobility Authority|Central Texas Regional Mobility Authority (CTRMA)]]. In December 2010, four alternative proposals were presented to the public, each of which would add one or more lanes; the "no-build" alternative was also presented.
The additions would not increase the right-of-way of the highway, but would be created by reducing the width of existing lanes and reducing and/or eliminating shoulders. An environmental study was completed in August 2012 with a [[Finding Of No Significant Impact]] and a recommendation of one new travel lane in each direction, operated as express lanes.<ref>{{cite web |last1=Ham |first1=Justin |title=Finding |url=http://www.mopacexpress.com/about/files/MoPacFONSI0823121.pdf |website=MoPac Improvement Project |publisher=U.S. Dept. of Transportation, Federal Highway Administration, Texas Division |access-date=September 5, 2016 |archive-url=https://web.archive.org/web/20170510150936/http://www.mopacexpress.com/about/files/MoPacFONSI0823121.pdf |archive-date=May 10, 2017 |url-status=live}}</ref>
Construction began in 2013, and was originally scheduled for completion in September 2015, but by August 2016, the Central Texas Regional Mobility Authority announced further delays.<ref>{{cite news |last1=Jechow |first1=Andy |title=Weather, paving corrections push back North MoPac opening date|url=http://kxan.com/2016/08/25/paving-corrections-push-back-north-mopac-opening-date/|access-date=September 5, 2016|work=KXAN-TV|date=August 25, 2016|archive-url=https://web.archive.org/web/20160829111941/http://kxan.com/2016/08/25/paving-corrections-push-back-north-mopac-opening-date/|archive-date=August 29, 2016|url-status=live}}</ref> The first of four tolled sections, specifically the northbound toll lane from RM 2222 to Parmer Lane, opened on October 17, 2016. The remainder of the northbound express lane, from Cesar Chavez Street to [[Farm to Market Road 734|Parmer Lane]], opened on October 7, 2017, and the entire southbound express lane opened on October 28, 2017.

====MoPac Intersections Project====
In 2013, CTRMA and TxDOT initiated an environmental study to analyze the best options to improve the MoPac intersections at Slaughter Lane and La Crosse Avenue. In December 2015, the study was completed with a Finding Of No Significant Impact for the project, which allowed it to move forward.<ref>{{cite web |url=http://www.mopacsouth.com/about/mopac-intersections.php |title=About MoPac Intersections |access-date=February 18, 2018 |archive-url=https://web.archive.org/web/20180219091010/http://www.mopacsouth.com/about/mopac-intersections.php |archive-date=February 19, 2018 |url-status=live}}</ref> The selected design included replacing the at-grade intersection at Slaughter Lane with a [[diverging diamond interchange|diverging diamond interchange (DDI)]]<ref>{{cite web |url=https://www.youtube.com/watch?v=TRs_ncEMkCY  |archive-url=https://ghostarchive.org/varchive/youtube/20211213/TRs_ncEMkCY |archive-date=2021-12-13 |url-status=live|title=MoPac South: Diverging Diamond Interchange Simulation |publisher=[[Central Texas Regional Mobility Authority]] |date=April 16, 2015 |access-date=September 30, 2018}}{{cbignore}}</ref> and the at-grade intersection at La Crosse Avenue with a [[diamond interchange]]. The project broke ground in January 2018 with Webber, LLC as the general contractor.

On August 10, 2018, the at-grade Slaughter Lane intersection was rerouted to the south as construction began on an overpass bridge on the original alignment.<ref>{{Cite web|url=https://www.kxan.com/news/local/travis-county/traffic-alert-construction-to-close-slaughter-lane-at-mopac-for-6-months/1230200106|title=Construction to close Slaughter lane at MoPac for 6 months|last=Crown|first=Rosemond|date=June 11, 2018|website=KXAN|language=en-US|access-date=April 2, 2019|archive-url=https://web.archive.org/web/20190402042736/https://www.kxan.com/news/local/travis-county/traffic-alert-construction-to-close-slaughter-lane-at-mopac-for-6-months/1230200106|archive-date=April 2, 2019|url-status=live}}</ref> The completed DDI opened to traffic on November 11, 2018, with final completion occurring in Spring 2019. The La Crosse Avenue intersection began construction in Fall 2018. On March 29, 2019, the La Crosse Avenue at-grade intersection was closed for reconstruction as a bridge.<ref>{{Cite web|url=https://communityimpact.com/austin/southwest-austin/top-stories/2019/03/28/detours-la-crosse-avenue-mopac-march-2019/|title=Detours for La Crosse Avenue at MoPac go into effect March 29|last=Cicale|first=Nicholas|date=March 29, 2019|website=Community Impact Newspaper|language=en-US|access-date=April 2, 2019|archive-url=https://web.archive.org/web/20190402022727/https://communityimpact.com/austin/southwest-austin/top-stories/2019/03/28/detours-la-crosse-avenue-mopac-march-2019/|archive-date=April 2, 2019|url-status=live}}</ref> The La Crosse Avenue bridge and intersection opened to traffic on April 16, 2020. The full project, including surrounding [[Noise barrier|sound walls]] and [[Infiltration basin|retention ponds]], was officially completed on December 16, 2020.<ref>{{Cite web|last=Cicale|first=Nicholas|date=2020-12-16|title=MoPac projects at Slaughter Lane, La Crosse Ave. completed|url=https://communityimpact.com/austin/southwest-austin-dripping-springs/transportation/2020/12/16/mopac-projects-at-slaughter-lane-la-crosse-ave-completed/|access-date=2021-11-05|website=impact|language=English}}</ref><ref>{{Cite web|url=https://www.txdot.gov/inside-txdot/projects/studies/austin/mopac-slaughter.html|title=MoPac Intersections|publisher=[[Texas Department of Transportation]]|website=www.txdot.gov|access-date=September 27, 2018|archive-url=https://web.archive.org/web/20180927204143/https://www.txdot.gov/inside-txdot/projects/studies/austin/mopac-slaughter.html|archive-date=September 27, 2018|url-status=live}} Note: This source incorrectly refers to interchanges as intersections.</ref>

==== MoPac South ====
In 2013, CTRMA and TxDOT initiated an environmental study of the MoPac corridor from Cesar Chavez Street to Slaughter Lane.<ref>{{Cite web|title=Project Overview {{!}} MoPac South Environmental Study|url=http://www.mopacsouth.com/about/|access-date=2021-11-05|website=www.mopacsouth.com}}</ref>  The environmental study identified the Express Lane(s) Alternative as the Recommended Build Alternative.<ref>{{Cite web|title=Environmental Study {{!}} MoPac South Environmental Study|url=http://www.mopacsouth.com/environmental/|access-date=2021-11-05|website=www.mopacsouth.com}}</ref> In October 2015, six proposals were presented to the public, each of which would add one of more express lanes; the "no-build" alternative was also presented.<ref>{{Cite web|date=2015-10-22|title=Mobility authority unveils MoPac South options|url=https://www.austinmonitor.com/stories/2015/10/mobility-authority-unveils-mopac-south-options/|access-date=2021-11-05|website=Austin Monitor|language=en-US}}</ref> In February 2016, the project was put on hold by a [[Save Our Springs Alliance|Save Our Springs]] lawsuit claiming the project had not complied with the National Environmental Policy Act's requirements for environmental studies.<ref>{{Cite web|date=2016-02-25|title=Group files lawsuit to stop South MoPac, SH 45 SW projects|url=https://www.kxan.com/news/group-files-lawsuit-to-stop-south-mopac-sh-45-sw-projects/|access-date=2021-11-05|website=KXAN Austin|language=en-US}}</ref> The lawsuit was settled on July 18, 2018 with a ruling in favor of CTRMA by the [[United States Court of Appeals for the Fifth Circuit|5th Circuit U.S. Court of Appeals.]]<ref>{{Cite web|last=Cicale|first=Nicholas|date=2018-07-19|title=Court rules on the side of CTRMA and TxDOT in lawsuit against South Austin transportation projects|url=https://communityimpact.com/southwest-austin/top-stories/2018/07/19/court-rules-on-the-side-of-ctrma-and-txdot-in-lawsuit-againts-south-austin-transportation-projects/|access-date=2021-11-05|website=impact|language=English}}</ref> However, the project was further delayed by a state moratorium on toll projects receiving funding from State Propositions 1 and 7. TxDOT gave CTRMA preliminary approval to resume planning for MoPac South in August 2019.<ref>{{Cite web|last=Ortiz|first=Edmond|date=2019-11-07|title=Austin: Mobility Authority Resumes Planning for New MoPac South Toll Roads|url=https://www.virtualbx.com/construction-preview/austin-mobility-authority-resumes-planning-for-new-mopac-south-toll-roads/|access-date=2021-11-05|website=Virtual Builders Exchange|language=en-US}}</ref> In November 2021, the project was officially revitalized with a virtual open house, and it is currently in public planning phases.

==Exit list==
{{jcttop|length_ref=|state=TX|unnum=yes}}
{{TXint
|county=Travis|cspan=35
|location=Austin|lspan=34
|mile=0.0
|road={{jct|state=TX|SH|45|dir1=west|Toll|45|dir2=east}}
}}
{{TXint
|mile=0.7
|road=South Bay Lane
|notes=At-grade intersection; dead end both directions, turnaround only
}}
{{TXint
|mile=1.5
|road=La Crosse Avenue
}}
{{TXint
|mile=2.3
|road=Slaughter Lane
|notes=Diverging Diamond Interchange
}}
{{TXint
|type=incomplete
|mile=2.9
|road=Davis Lane
|notes=Southbound exit and northbound entrance
}}
{{TXint
|mile=4.7
|road=William Cannon Drive
}}
{{TXint
|mile=6.0
|road={{jct|state=TX|US|290|SH|71|extra=hospital|road|Southwest Parkway|city1=Johnson City|city2=Llano|city3=Sunset Valley}}
|notes=Access to [[Baylor Scott & White Medical Center – Temple|Baylor Scott & White Medical Center – Austin]]
}}
{{TXint
|type=incomplete
|mile=6.6
|road=Frontage Road
|notes=Southbound exit only
}}
{{TXint
|mile=7.5
|road={{jct|state=TX|Loop|360|name1=Capital of Texas Highway}}
|notes=Only one exit ramp travels from southbound Loop&nbsp;1 to southbound Loop&nbsp;360; all others are at-grade
}}
{{TXint
|mile=8.9
|road=Barton Skyway
}}
{{TXint
|mile=9.8
|road={{jct|state=TX|RM|2244|name1=Bee Caves Road|city1=Rollingwood|city2=West Lake Hills|road|Wallingwood Drive}}
}}
{{TXint
|bridge=Roberta Crenshaw Bridge over the [[Colorado River (Texas)|Colorado River]]
}}
{{TXint
|mile=
|road={{jct|state=TX|Loop-Express|1|dir1=begins}}
|type=toll
|notes=South end of variable toll lanes
}}
{{TXint
|mile=10.5
|road=Cesar Chavez Street / 5th Street / Lake Austin Boulevard<!--two separate exits southbound-->
}}
{{TXint
|mile=11.2
|road=Enfield Road
}}
{{TXint
|mile=11.7
|road=Windsor Road
}}
{{TXint
|mile=12.3
|road=Westover Road / Northwood Road
}}
{{TXint
|mile=12.9
|road={{jct|extra=hospital}} 35th Street – [[Camp Mabry]]
|notes=Access to Seton Shoal Creek Hospital
}}
{{TXint
|mile=13.8
|road=45th Street
}}
{{TXint
|mile=14.8
|road={{jct|state=TX|RM|2222|name1=Northland Drive}}
}}
{{TXint
|mile=
|road={{jct|state=TX|Loop-Express|1}}
|type=toll
|notes=Access point for variable toll lanes
}}
{{TXint
|mile=15.9
|road=Far West Boulevard
}}
{{TXint
|mile=16.6
|road=Anderson Lane / Spicewood Springs Road
|notes=Direct northbound exit and southbound entrance (southbound exit signed at Steck Avenue)
}}
{{TXint
|mile=17.1
|road=Steck Avenue
|notes=No direct northbound entrance<!--not signed at Capital of Texas Highway-->
}}
{{TXint
|type=closed
|mile=17.3
|road=(no name)
|notes=Northbound exit only; replaced by northbound collector distributor road underneath Steck Avenue<ref>{{cite web|url=http://www.mopacexpress.com/construction/whats-new.php|title=Mopac Improvement: Steck Avenue Collector-Distributor Lane Construction|access-date=June 22, 2016|archive-url=https://web.archive.org/web/20160609124401/http://www.mopacexpress.com/construction/whats-new.php|archive-date=June 9, 2016|url-status=live}}</ref>
}}
{{TXint
|mile=18.0
|road={{jct|state=TX|US|183|name1=Research Boulevard|extra=hospital}}
|notes=No direct southbound exit to US 183 north (signed at Capital of Texas Highway), access to Seton Northwest Hospital
}}
{{TXint
|mile=18.7
|road=[[Capital of Texas Highway]]
}}
{{TXint
|mile=19.1
|road=Braker Lane – [[Q2 Stadium]]
|notes=Direct southbound exit and northbound entrance (northbound exit signed at Capital of Texas Highway)
}}
{{TXint
|type=concur
|mile=20.5
|road={{jct|state=TX|FM|1325|dir1=south|name1=Burnet Road|road|Duval Road|extra=hospital}}
|notes=South end of FM&nbsp;1325 overlap, access to North Austin Medical Center<!--at least northbound; southbound may not overlap-->
}}
{{TXint
|mile=
|road={{jct|state=TX|Loop-Express|1|dir1=ends}}
|type=toll
|notes=North end of variable toll lanes; despite being signed as such, no direct access to FM&nbsp;734 (Parmer Lane) exists
}}
{{TXint
|mile=21.7
|road={{jct|state=TX|FM|734|name1=Parmer Lane}}
}}
{{TXint
|mile=22.4
|road=Scofield Ridge Parkway
|notes=Last free northbound exit before toll road begins; no direct southbound exit
}}
{{TXint
|type=trans
|mile=22.4
|road={{jct|state=TX|Loop|1|dir1=ends|nolink1=yes}}<br/>{{jct|state=TX|Toll|1|dir1=begins|nolink1=yes}}
|notes=Northern terminus of Loop 1 (Mopac Expressway); southern terminus of Loop 1 Toll
}}
{{TXint
|type=toll
|mile=23.1
|road={{jct|state=TX|FM|1325|road|Wells Branch Parkway / Howard Lane, Merrilltown Drive}}
|notes={{jct|extra=rail}} [[Howard station (Capital MetroRail)|Howard station]]
}}
{{TXint
|type=toll
|location=none
|mile=24.0
|place=Merrilltown Toll Plaza
}}
{{TXint
|type=incomplete
|county1=Travis
|county2=Williamson
|location=none
|mile=24.5
|road=Shoreline Drive
|notes=No southbound exit
}}
{{TXint
|county=Williamson
|location=none
|mile=25.6
|road={{jct|state=TX|Toll|45|to2=y|I|35}}
}}
{{jctbtm|keys=concur,incomplete,toll,closed,trans}}

==See also==
*
*{{portal-inline|U.S. Roads}}
==References==
{{Reflist}}
{{refbegin}}
*{{cite press release |publisher= Texas Tollways |date= June 26, 2003 |title= Construction contract for Loop 1 extension awarded |url= http://www.texastollways.com/tta/article.asp?itemID=25 }}
*{{cite web |url= http://www.txdot.gov/project_information/projects/austin/mopac1/history.htm |title= Loop 1 History |publisher= Texas Department of Transportation |access-date= January 3, 2009 |url-status= dead |archive-url= https://web.archive.org/web/20100507190843/http://www.txdot.gov/project_information/projects/austin/mopac1/history.htm |archive-date= May 7, 2010 }}
*{{cite press release |publisher= Central Texas Turnpike System |date= September 18, 2006 |title= Austin toll roads will open November 1 |url= http://www.centraltexasturnpike.org/pdf/NR-opening%20date%20announcementI.pdf |url-status= dead |archive-url= https://web.archive.org/web/20070620213358/http://www.centraltexasturnpike.org/pdf/NR-opening%20date%20announcementI.pdf |archive-date= June 20, 2007 }}
{{refend}}

==External links==
{{Attached KML|Texas State Highway Loop 1|display=title,inline}}
{{Commons category|Texas State Highway Loop 1}}

{{Austin Streets}}
{{Toll Roads in Texas}}

[[Category:State highway loops in Texas|001]]
[[Category:Toll roads in Texas|001]]
[[Category:Freeways in Texas]]
[[Category:Transportation in Austin, Texas]]
[[Category:Transportation in Travis County, Texas]]
[[Category:Transportation in Williamson County, Texas]]
[[Category:Missouri Pacific Railroad]]