| Cherry Creek | |
| Map: | Tuolumnemap-01.png |
| Map Size: | 300 |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | California |
| Length: | 27.7miles |
| Discharge1 Location: | below Holm Powerplant, near the mouth[1] |
| Discharge1 Min: | 1.6cuft/s |
| Discharge1 Avg: | 694cuft/s |
| Discharge1 Max: | 33500cuft/s |
| Source1: | Sierra Nevada |
| Source1 Location: | Emigrant Wilderness, Tuolumne County |
| Source1 Coordinates: | 38.0983°N -119.7897°W[2] |
| Source1 Elevation: | 7119feet |
| Mouth: | Tuolumne River |
| Mouth Location: | West of Mather, Tuolumne County |
| Mouth Coordinates: | 37.8886°N -119.9719°W |
| Mouth Elevation: | 2162feet |
| Basin Size: | 216.3sqmi[3] |
Cherry Creek is a large, swift-flowing[4] stream in the Sierra Nevada mountain range, and is the largest tributary of the Tuolumne River. The creek is 44.6miles long measured to its farthest headwaters;[3] the main stem itself is 27.7miles long,[3] draining a watershed of 234mi2 in the Stanislaus National Forest. Part of the drainage also extends into the northwest corner of Yosemite National Park.
Cherry Creek originates at the confluence of its North and East Forks in Lord Meadow, at 7119feet in the Emigrant Wilderness of the Stanislaus National Forest just north of the national park boundary. It flows west then southwest through the rugged granite formations of the deep Cherry Creek Canyon. After joining with West Fork Cherry Creek, it flows south into Cherry Lake, a large reservoir formed by the Cherry Valley Dam. Below the dam the creek receives Eleanor Creek from the left and continues for about 10miles south then west through a canyon in the Sierra Nevada foothills to its confluence with the Tuolumne River about 6miles west of Mather.[5]
The East Fork Cherry Creek,[6] 14.4miles long,[3] has its beginnings at Summit Meadow near Bigelow Peak and the Tuolumne-Mono County line, at an elevation of 9399feet.[7] It flows southwest through long, narrow Huckleberry Lake at 7861feet[8] and continues to descend steeply to the confluence with the North Fork at Lord Meadow.[5]
The North Fork Cherry Creek[9] is 16.9miles long.[3] It is located north of, and flows largely parallel to the East Fork. Its source is at High Emigrant Lake, at an elevation of 9711feet.[10] It flows southwest through Emigrant Meadow Lake, Middle Emigrant Lake and then into the much larger Emigrant Lake at 8832feet.[11] Below Emigrant Lake it flows through Cow Meadow Lake and then continues through a canyon to its confluence with the East Fork.[5]
The West Fork Cherry Creek,[12] 17.8miles long,[3] originates at the Pinto Lakes at 9383feet[13] and initially flows west before turning south and picking up Spring Creek. It turns southwest, receiving the larger Buck Meadow Creek from the left and then Piute Creek from the right. It joins Cherry Creek about a mile (1.6 km) above Cherry Lake at an elevation of 5128feet.[5] [12]
Eleanor Creek[14] is the main tributary of lower Cherry Creek, joining it about 5miles below Cherry Valley Dam. Eleanor Creek begins at the confluence of Bartlett and Kendrick Creeks inside Yosemite National Park and flows into Lake Eleanor, a natural lake enlarged by the Lake Eleanor Dam. Below the dam it flows through a short, steep canyon before its confluence with Cherry Creek.[5] Measured to the head of Kendrick Creek, the drainage is 23miles long.[3]
The Cherry Creek watershed has a long history of development for hydroelectric power, water supply and flood control. The first dam in the Cherry Creek watershed was the multiple-arch Lake Eleanor Dam, built in 1918 as part of the Hetch Hetchy Project which provides water and power to the city of San Francisco. Although the actual source of the water supply is from the Hetch Hetchy Reservoir on the Tuolumne River, the dam at Lake Eleanor provided the electric power needed for construction work at O'Shaughnessy Dam and the Hetch Hetchy Aqueduct, and also for the construction of Cherry Valley Dam 30 years later. The first power at Early Intake Powerhouse was generated on May 6, 1918.[15]
Construction on Cherry Valley Dam, which dams the main Cherry Creek to form Cherry Lake, began in August 1953 and was completed in October 1955. The 315feet high rockfill dam was built by San Francisco and the Modesto and Turlock Irrigation Districts.[15] The reservoir has a capacity of 273500acre feet and is linked to Lake Eleanor via a tunnel, allowing the two reservoirs to essentially operate as one. It provides drinking water and flood control for communities in the Central Valley, and generates hydroelectricity at the Dion R. Holm Powerhouse (originally named Cherry Powerhouse), which began operation on August 1, 1960, superseding the Early Intake Powerhouses.[15] A 6miles long tunnel carries water from Cherry Lake to the powerhouse where it drops 2100feet, powering two generators with a combined 165,000 kilowatt capacity.[16]
Cherry Creek is home to both native and introduced fish species. Brown bullhead, brown trout and golden shiner are present both above and below Cherry Lake. The upper part of Cherry Creek has wild brook trout, and green sunfish are present in the lower creek.[17] [18] Before the damming of the Tuolumne River in the early 20th century, the creek also had annual runs of chinook salmon and steelhead trout.[19]
At its headwaters, Cherry Creek flows through granite valleys similar to those found in Yosemite Valley, though these areas are accessible only to backpackers.
Whitewater rafting on portions of Cherry Creek is classed in the very difficult Class V/V+ category and has been called by one commentator "without a doubt the most difficult commercially run river in the country."