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Construction on the highway began in 1928, which involved the boring of three tunnels. Previously, the road was signed as U.S. Route 40 Alternate, crossing the Sierra Nevada at a lower elevation than Donner Pass on US 40, now Interstate 80 (I-80). The road was renumbered SR 70 in the 1964 state highway renumbering. Today, portions of SR 70 have ...
The creek was named by the Spanish Gaspar de Portolá expedition of 1769, which crossed the Santa Ana River near where it meets the Santiago Creek. [3] In the 1870s there was a short-lived silver boom along the tributary Silverado Creek. In 1929 the Santiago Dam was built to form Irvine Lake, to supply irrigation water.
The state highway system of the U.S. state of California is a network of highways that are owned and maintained by the California Department of Transportation (Caltrans). Each highway is assigned a Route (officially State Highway Route [ 1 ] [ 2 ] ) number in the Streets and Highways Code (Sections 300–635) .
Loch Lomond (California) Newell Creek Dam: Newell Creek: Santa Cruz: Santa Cruz Water Dept. [7] 1960: Earth: 190 58: 9,200: 11,300 Loon Lake: Loon Lake Dam: Gerle Creek: El Dorado: Sacramento Municipal Utility District: 1963: Rock-fill: 108: 33: 76,500: 94,500 Lopez Lake: Lopez Dam: Arroyo Grande Creek: San Luis Obispo: San Luis Obispo County ...
A drop structure, also known as a grade control, sill, or weir, is a manmade structure, typically small and built on minor streams, or as part of a dam's spillway, to pass water to a lower elevation while controlling the energy and velocity of the water as it passes over.
The Sacramento Weir is opened manually when the Sacramento River reaches 27.5 feet (8.4 m) at the I Street Bridge. It was built in 1916 by the City of Sacramento and contains 48 gates over its 1,920-foot (590 m) length; water from the Sacramento Weir flows through the 1 mile (1.6 km) long Sacramento Bypass and drains into the Yolo Bypass. [6]
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State Route 91 (SR 91) is a major east–west state highway in the U.S. state of California that serves several regions of the Greater Los Angeles urban area. A freeway throughout its entire length, it officially runs from Vermont Avenue [3] in Gardena, just west of the junction with the Harbor Freeway (Interstate 110, I-110), east to Riverside at the junction with the Pomona (SR 60 west of SR ...