Jones Creek, Houghton Creek, Sulphur Creek, Sweetwater Creek
Kelsey Creek is a watercourse in Lake County, California, United States, that feeds Clear Lake from the south. Originally forest-covered, the watershed has been converted in the lower parts to farmland and for urban use. Higher up, the forests have been cleared, regrown, and cleared again. The northern part of the creek flows through a geothermal field that feeds power plants and hot springs. The wooded Cobb area in the higher part of the watershed was once home to resorts as early as the 1850s.
The creek takes its current name from Andrew Kelsey, one of the first Anglo-American settlers in Lake County.[1] Kelsey was killed in 1849 in an uprising against him by Wappo and Eastern Pomo Indians he had enslaved. This episode led to the Bloody Island Massacre on an island in Clear Lake.[2] Until the 1870s, "Kelsey Creek" was also commonly used to designate the general area that would eventually be officially become Kelseyville.[3] It was also the name of a school district until 1920.
Kelsey Creek is about 22.5 miles (36.2km) long. It forms on Cobb Mountain at 3,840 feet (1,170m) above sea level and drops to 1,318 feet (402m) at Clear Lake.[8] It flows in a northwest direction through the mountains to Big Valley, then flows north to the lake, which it enters through Clear Lake State Park.[9] At its mouth it is called Kelsey Slough.[10]Kelseyville is the largest community in the watershed, on the east side of Big Valley.[11] The creek is the third largest watercourse flowing into Clear Lake.[12] Between 1982 and 2005 stream flow near the creek's mouth averaged 81.9 cubic feet (2.32m3) per second.[13]
The creek bed is fairly steep in the upper reaches and through the canyons, flattening out in the plains that open to Big Valley. Upstream Kelsey Creek and tributaries such as Lee Creek, Jones Creek and Alder Creek flow year round. Downstream, the section of Kelsey Creek from Main Street Bridge in Kelseyville to the lake is usually dry in mid-summer.[8] There are 15 feet (4.6m) falls about 3.5 miles (5.6km) below Glenbrook, and lower down there are 20 feet (6.1m) falls about 3.3 miles (5.3km) above the confluence with Sweetwater Creek. Fish cannot pass these falls.[8]
Geology
The region holds greywacke sandstone, chert and serpentinite rocks of the Franciscan Assemblage that have been highly sheared and faulted with ridges and valleys trending northwest–southeast.[14] The area is seismically very active, but the earthquakes are low intensity. Landslides are very common throughout the upper part of the watershed, The Geysers area. In this area the soils are shallow loams and gravelly loams over bedrock, and are relatively infertile with low levels of nitrogen. They are vulnerable to erosion if disturbed by construction.[15]
The watershed of the creek covers 28,614 acres (11,580ha) in Lake County. It is a narrow corridor that runs northwest through the Northern California Coast Ranges into Big Valley, a flat region south of the western part of Clear Lake. It is about 10% of the Clear Lake watershed, and contributes about 16% of the water flowing into the lake. The highest point is the summit of Cobb Mountain at 4,722 feet (1,439m) above sea level, and the lowest area is the flat farmlands of Big Valley beside Clear Lake at 1,318 feet (402m) above sea level.[16]
Geothermal field
The Geysers geothermal field includes the upper Kelsey Creek Watershed, as well as parts of Lake and Sonoma counties to the south. From the 1850s hot spring resorts to the east of the upper Kelsey Creek began to attract visitors. The first viable geothermal power plant was developed in 1956. As of 2010 there were about sixty active geothermal wells in the watershed.[17] A 1981 report noted that geothermal plants in the Kelsey Creek area were causing air quality problems through hydrogen sulfide emissions. Construction of roads and drill pads opens large areas of soil to erosion by heavy rains, washing into the creek's tributaries and degrading water quality. The power plants also interfere with activities such as hunting, fishing and general recreation.[18]
Ecology
Annual precipitation in the upper part ranges from 25 to 80 inches (640 to 2,030mm), with highest rainfall along the crest of the Mayacamas Mountains.[19] At one time valley oak woodlands may have covered most of Big Valley, and some remnants of these woodlands remain near the shores of the lake and along watercourses.[11] Better roads in the early 20th century led to an increase in production of walnuts, pears and grapes, mainly in the flat part of Big Valley.[17] Most of Big Valley is now used for agriculture or is urbanized.
South of Big Valley in the higher country, the main vegetation is blue oak woodlands, gray pines and annual grasslands. Above about 2,000 feet (610m) the main land cover is chaparral, with patches of California live oak woodlands on the higher ridges. The upper end of the watershed has soils of volcanic materials, with conifer or hardwood-conifer forests. The Cobb area's resort and residential communities lie within these forests.[11]
Kelsey Creek is host to the Clear Lake hitch, a threatened species which was once a staple of the local Native American populations and only found in Clear Lake in its tributaries. Invasive and introduced species such as catfish, bass and carp into Clear Lake, as well as historically low creek water levels and diversions are also believed to have contributed to the hitch's population decline.[20]
1907. Sacramento pikeminnow stranded after spawning in Kelsey Creek when the water level dropped after a rain.
As of March 2024, farming operations along the Big Valley Groundwater Basin watershed (which includes Kelsey Creek and its Cole Creek tributary) have been ordered to report of their water use by the California State Water Resources Control Board in order to study the effect of groundwater pumping and water diversions on the Clear Lake hitch spawning and migration.[21]
The Clear Lake splittail (Pogonichthys ciscoides), which once also swam in Kelsey Creek, has not been observed since the 1970s. According to a Pomo elder, chi and hitch are both Pomo words, chi describing the hitch, and hitch was used to describe the Clear Lake splittail.[20] The Sacramento pikeminnow (Ptychocheilus grandis) and the Sacramento sucker (Catostomus occidentalis), both native fish, were last observed in the 1970s.[22]
The rainbow trout (Oncorhynchus mykiss), native to Clear Lake, seems to have been introduced in the upper section of Kelsey Creek after the arrival of white settlers, and several fisheries developed in the area. Before 1955, the Department of Fish and Game also introduced the non-native brown trout in the stream.
In 1856 John Cobb opened the first sawmill along Kelsey Creek in Cobb Valley. Lumber was needed for underground supports in the borax mine at Borax Lake, north of Clearlake, and in the Sulphur Bank Mine. Wood was also needed for the mines' reducing furnaces. Most of this came from the volcanic uplands of Kelsey Creek and neighboring watersheds. By the end of the 19th century most of the prime timber in the Boggs Mountain area had been cleared, and the land was mainly being used for pasturage rather than timber. After World War II (1939–1945) there was a boom in construction, and all the usable old-growth and secondary forest was clear cut. The state bought the land for the Boggs Mountain Demonstration State Forest for just $38,700 because it held no timber of commercial value.[23]
Tourism
In the 1850s, people from the San Francisco Bay Area and the Central Valley began to vacation in resorts in the Kelsey Creek area. The Glenbrook Resort was a stage stop between the Bay Area and Clear Lake, with resorts both north and south of Glenbrook. Road improvements in the 1910s and 1920s resulted in new resorts being opened along the roads.[17] In the early 1920s, Jim McCauley established a resort on the creek between Cobb and Whispering Pines, west of his Boggs Mountain property. It was originally named Camp Calso but renamed to Forest Lake Resort in 1938. McCauley dammed a tributary of Kelsey Creek to create Lake McCauley in 1935.[24]
Durham, David L. (1998), California's Geographic Names: A Gazetteer of Historic and Modern Names of the State, Clovis, Calif.: Word Dancer Press, p.87, ISBN1-884995-14-4
Lake County is a county located in the north central portion of the U.S. state of California. As of the 2020 census, the population was 68,163. The county seat is Lakeport. The county takes its name from Clear Lake, the dominant geographic feature in the county and the largest non-extinct natural lake wholly within California.
Kelseyville is a census-designated place (CDP) in Lake County, California, located six miles southeast of Lakeport, at an elevation of 1,384 feet. Its population was 3,382 according to the 2020 United States census.
Clear Lake is a natural freshwater lake in Lake County in the U.S. state of California, north of Napa County and San Francisco. It is the largest natural freshwater lake wholly within the state, with 68 square miles (180 km2) of surface area. It has an age of nearly 500,000 years. It is the latest lake to occupy a site with a history of lakes stretching back at least 2,500,000 years.
The Mayacamas Mountains are located in northwestern California in the United States. The mountain range is part of the Northern Inner Coast Ranges, of the California Coast Ranges System.
The Russian River is a southward-flowing river that drains 1,485 sq mi (3,850 km2) of Sonoma and Mendocino counties in Northern California. With an annual average discharge of approximately 1,600,000 acre feet (2.0 km3), it is the second-largest river flowing through the nine-county Greater San Francisco Bay Area, with a mainstem 115 mi (185 km) long.
The Bloody Island Massacre was a mass killing of indigenous Californians by the U.S. Military that occurred on what was then an island in Clear Lake, California, on May 15, 1850. It is part of the wider California genocide.
Cobb Mountain is the tallest mountain in the Mayacamas Mountains of California.
East Fork Russian River is a 15 mi (24 km) long tributary of the Russian River in Mendocino County, California artificially connected to the Eel River via an interbasin diversion at the Potter Valley Project hydroelectric facility. It forms in the north of Potter Valley, flows south through this valley, then southwest through a mountain pass to Lake Mendocino, an artificial reservoir that empties into Russian River. At one time Clear Lake to the east drained through Cold Creek then along the lower part of East Fork Russian River through Coyote Valley to the Russian River proper. A few hundred years ago a massive landslide blocked this channel, and Clear Lake found a new outlet to the Sacramento River.
Boggs Mountain Demonstration State Forest is a state forest in Lake County, California that covers the northwest of Boggs Mountain. It was founded in 1949, and came into operation in 1950 when most of the site had been clear cut. The purpose was to demonstrate good practices in restoring and managing a forest. The state forest was open for recreational use, including camping, hiking, mountain biking etc. The 2015 Valley Fire destroyed 80% of the trees. The state forest as of 2021 was replanting saplings.
Glenbrook was a resort in Lake County, California. It was located 10 miles (16 km) south-southeast of Kelseyville, at an elevation of 2293 feet.
Saratoga Springs is a set of springs that was turned into a resort in the 1870s in Lake County, California. At its peak the resort could accommodate 250 people. The resort was closed after the main hotel burned down, but reopened as a retreat in 1991.
Boggs Mountain is a mountain the Mayacamas Mountains in Lake County, California. Part of the mountain holds the Boggs Mountain Demonstration State Forest. About 80% of the trees were burned in the September 2015 Valley Fire.
Cow Mountain is a ridge in the Mayacamas Mountains in Lake County, California, and Mendocino County, California. It is home to two large recreation areas. One is closed to off-road vehicles and the other is not. Erosion from the mountain, caused in part by human land use, contributes sediment and nutrients to Clear Lake.
Cow Mountain Ridge is a ridge in Lake County, California, and Mendocino County, California. It joins Cow Mountain from the south.
Scotts Creek is a stream in Lake County, California, the largest tributary of Clear Lake. It rises to the south of Cow Mountain in the Mayacamas Mountains, then flows southeast towards Clear Lake, running through the fertile Scotts Valley and the seasonal Tule Lake before joining Middle Creek and flowing into the lake via Rodman Slough.
Mahnke Peak is a 3,652 feet (1,113 m) mountain in Mendocino County, California.
Cold Creek is a river of Mendocino County, California, a tributary of East Fork Russian River. In the past it may have connected Clear Lake to the Russian River before this route was blocked by a large landslide and Clear Lake began to drain into the Sacramento River watershed.
The Blue Lakes are a string of two or three lakes in Lake County, California, set in a deep canyon. At one time they seem to have been in the Russian River watershed, but a recent geological upheaval cut them off from that basin and they now drain via Scotts Creek into Clear Lake in the Sacramento River basin. In the 19th and early 20th centuries there were several resorts around the lakes. Their waters have been highly altered by human activity and most of their native fish are lost, but they have a healthy population of largemouth bass.
Middle Creek is a creek that drains through Rodman Slough into Clear Lake in Lake County, California. It supplies 21% of the streamflow to Clear Lake. The watershed vegetation has been drastically modified by European settlers through sheep and cattle grazing, logging and farming in the valley floors. The creek once flowed through extensive wetlands at its mouth, but these were mainly drained to create farmland, apart from Rodman Slough on the west side. There are now projects to restore the drained land to its original condition.
Rivers and creeks in Lake County, California are listed below by river basin and alphabetically. Unless otherwise stated, the information is taken from the Geographic Names Information System maintained by the United States Geological Survey. Coordinates, elevations and lengths from this source are approximate.
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