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2025-04-06T10:26:51Z

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{{Infobox power transmission line
| name = Carquinez Strait Powerline Crossing
| photo = South tower, at Crockett, looking over Carquinez Straits (14780004404).jpg
| caption = South tower at [[Crockett, California]], looking over [[Carquinez Strait]], before 1914
| map =
| country = United States
| state = California
| province =
| coordinates = 
| direction =
| start =
| through =
| finish =
| par =
| owner =
| partners =
| operator = [[Bay Counties Power Company]]
| cable_manufacturer =
| cable_installer =
| cable_layer =
| substation_manufacturer =
| substation_installer =
| contractors =
| construction =
| expected =
| est =
| decom = yes
| type =
| current_type =
| length =
| length_mi =
| tower_no =
| capacity =
| AC_voltage = 60 kV
| DC_voltage =
| poles_no =
| circuits_no =
}}
'''Carquinez Strait Powerline Crossing''' was the world's first powerline crossing of a large river. It was built in 1901 for a 60 kV powerline operated by [[Bay Counties Power Company]] to deliver electric power from their Colgate powerhouse to [[Oakland, California]]. For this a crossing of [[Carquinez Strait]] was required, which has at its narrowest point at Dillon Point a width of {{convert|838|m|mi|2}}. Such a span width was impossible with wooden poles, which were common in those days. Installing an underwater cable was considered, but for reliability reasons an [[overhead power line]] was installed, which used at the north site of the river a {{convert|68|m|ft|2}} tall lattice tower and at the south site one with a height of {{convert|20|m|ft|0}}.

The project was designated as a California Historic Civil Engineering Landmark by the [[American Society of Civil Engineers]] in 1976.<ref>{{Cite news |last=Minahen |first=Betty |date=September 17, 1976 |url=https://www.newspapers.com/article/the-times-herald-noted-carquinez-power-l/169616553/ |title=Noted Carquinez Power Lines Get Recognition |work=The Times-Herald |location=Vallejo, California |pages=1, [https://www.newspapers.com/article/the-times-herald-carquinez-electrical-la/169616647/ 2] |access-date=April 5, 2025 |via=Newspapers.com}}</ref><ref>{{cite news |last=Ivers |first=Jack |date=September 17, 1976 |url=https://www.newspapers.com/article/concord-transcript-engineering-feat-hail/169686728/ |title=Engineering feat hailed |work=Concord Transcript |access-date=April 6, 2025 |via=Newspapers.com}}</ref>

[[File:Pacific service magazine (1924) (14778291801).jpg|thumb|In 1914, a second circuit was added.]]

== References ==
{{Reflist}}

== External links ==
* [https://web.archive.org/web/20090611002434/http://www015.upp.so-net.ne.jp/overhead-TML/sanfrancisco.html] (Japanese)
* {{HAER |survey=CA-191 |id=ca2384 |title=Carquinez Straits Transmission Span |photos=27 |data=14 |cap=2}}

{{coord|38|03|23|N|122|12|05|W|region:US-CA_type:landmark_source:kolossus-dewiki|display=title}}

[[Category:Powerline river crossings]]
[[Category:Carquinez Strait]]
[[Category:Energy in the San Francisco Bay Area]]
[[Category:Electric power infrastructure in the United States]]
[[Category:Buildings and structures in Contra Costa County, California]]
[[Category:Buildings and structures in Solano County, California]]
[[Category:History of the San Francisco Bay Area]]
[[Category:1901 establishments in California]]

{{California-struct-stub}}

Carquinez Strait Powerline Crossing - Revision history

imported>Transpoman: Added reference