Ryan Dam
Script error: No such module "Unsubst".Script error: No such module "Type in location".Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters".Expression error: Unexpected < operator. Ryan Dam is a hydroelectric dam on the Missouri River, Script error: No such module "convert". downstream from the city of Great Falls in the U.S. state of Montana. The dam is Script error: No such module "convert". long and Script error: No such module "convert". high; its reservoir is Script error: No such module "convert". long and has a storage capacity of Script error: No such module "convert".. It is a run-of-river dam. The dam is built on the largest of the five Great Falls of the Missouri, the "Big Falls",[1] also sometimes called "Great Falls".[1] Since 1915, the six-unit powerhouse on the left side of the dam has occupied a significant portion of the Script error: No such module "convert". high waterfall.
The dam, built in 1915[2] just upstream of the falls and a small island named Ryan Island, is divided into two parts. On the right side of the dam is a concrete-arch spillway structure, that when functioning, releases water over the remains of the waterfall. The center part of the dam consists of a dike that extends from the falls' base to Ryan Island (separating the tailrace from the main river, which it meets a few hundred yards downstream). It also contains a concrete gravity structure facing towards the right bank of the river and tilted to face slightly downstream. This segment of the dam contains the outlet works, a water jet that bursts out and cascades over the waterfall. The left side of the dam is a large powerhouse topped by a concrete gravity structure.
Montana Power Company originally built the dam, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014. Since the dam's construction in the Missouri River gorge, it has flooded a fair portion of the Great Falls - the cascades between Grand Fall and Crooked Falls, which lies several miles upstream - and reduced the flow over Great Falls to such an extent that much of the bedrock is visible. The dam was constructed on top of a Script error: No such module "convert". cascade that Lewis and Clark observed to lie just upstream of Grand Fall. The next dam upstream is Cochrane Dam, then Rainbow Dam, and Black Eagle Dam. The next dam downstream is Morony Dam.
References
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External links
- Ryan Dam at pplmontana.com
- Historic American Engineering Record (HAER) documentation, filed under Missouri River, Northeast of Great Falls, Cascade County, MT:
- Pages with script errors
- Arch–gravity dams
- Buildings and structures in Cascade County, Montana
- Dams completed in 1915
- Dams in Montana
- Dams on the Missouri River
- Energy infrastructure completed in 1915
- Historic American Engineering Record in Montana
- NorthWestern Corporation dams
- Run-of-the-river power stations
- 1915 establishments in Montana