Williamson River (Oregon)
Upstream view within the Williamson River Indian Mission in Chiloquin
|Name origin: Robert S. Williamson, who conducted Pacific Railroad Surveys in central Oregon|
|Source||near Bottle Spring|
|- location||Winema National Forest|
|- elevation||5,100 ft (1,554 m) |
|Mouth||Upper Klamath Lake|
|- location||near Modoc Point|
|- elevation||4,147 ft (1,264 m) |
|- coordinates||Coordinates: |
|Length||100 mi (161 km) |
|Basin||3,000 sq mi (7,770 km2) |
|Discharge||for near Chiloquin, 10.3 miles (16.6 km) from the mouth|
|- average||1,032 cu ft/s (29 m3/s) |
|- max||17,100 cu ft/s (484 m3/s)|
|- min||285 cu ft/s (8 m3/s)|
The Williamson River of south-central Oregon in the United States is about 100 miles (160 km) long. It drains about 3,000 square miles (7,800 km2) east of the Cascade Range. Together with its principal tributary, the Sprague River, it provides over half the inflow to Upper Klamath Lake, the largest freshwater lake in Oregon. The lake's outlet is the Link River, which flows into Lake Ewauna and the Klamath River.
The Williamson rises from a large spring in central Klamath County, on the north side of Fuego Mountain, in the Winema National Forest, about 40 miles (64 km) northeast of Klamath Falls. It flows in a large arc north through the mountains, then west, then southwest through Klamath Marsh and the Klamath Marsh National Wildlife Refuge. Downstream of the refuge, the river flows roughly parallel to U.S. Route 97, receiving Spring Creek from the right at Collier Memorial State Park, about 5 miles (8.0 km) north of Chiloquin. At Chiloquin, it receives the Sprague River from the left at about river mile (RM) 11 or river kilometer (RK) 18. The Williamson enters the northern end of Upper Klamath Lake near Modoc Point, about 20 miles (32 km) northwest of Klamath Falls.
At lower elevations along big streams, the Williamson watershed supports irrigated pastures and other farmlands. Livestock grazing occurs in many locations in the basin. Forests, often cut for timber, cover about 81 percent of the basin and farms account for 6 percent, while range, wetlands, water, and urban areas cover a combined 13 percent. Precipitation in the basin, which lies in the rain shadow of the Cascade Range, averages 23 inches (580 mm) a year along the Williamson above its confluence with the Sprague and about 20 inches (510 mm) along the Sprague.
The Williamson is known for especially large wild Great Basin redband trout, which move into the river to spawn and to escape Upper Klamath Lake when it gets warm. Three-year-old fish "commonly reach 20 inches or better." Smaller numbers of brown trout also thrive in the Williamson, especially below Spring Creek. Lost River suckers also populate the river but are protected and cannot be caught and kept legally. Smaller rainbow trout and brook trout live in the river above Klamath Marsh. Much of the land along the river is privately owned, and public access is limited.
Since 2003, The Nature Conservancy and other organizations have been working to restore about 12 square miles (31 km2) of wetlands in the Williamson River delta at the north end of Upper Klamath Lake. Formerly diked and drained for farming, the delta provides habitat for millions of migrating birds as well as many native species of fish, mollusks, and aquatic plants.
- McArthur, Lewis A.; Lewis L. McArthur (2003) . Oregon Geographic Names (7th ed.). Portland: Oregon Historical Society Press. pp. 1043–44. ISBN 0-87595-277-1.
- Source elevation derived from Google Earth search using GNIS source coordinates.
- "Williamson River". Geographic Names Information System. United States Geological Survey (USGS). November 28, 1980. Retrieved August 16, 2010.
- Sheehan, Madelynne Diness (2005). Fishing in Oregon: The Complete Oregon Fishing Guide (10th ed.). Scappoose, Oregon: Flying Pencil Publications. pp. 298–300. ISBN 0-916473-15-5.
- Risley, John C.; Laenen, Antonius (1999). "Upper Klamath Lake Basin Nutrient-Loading Study—Assessment of Historic flows in the Williamson and Sprague Rivers" (PDF). United States Geological Survey (USGS). p. 2. Retrieved March 4, 2011.
- "Water-Date Report 2009: 11502500 Williamson River below Sprague River, near Chiloquin, OR" (PDF). United States Geological Survey. Retrieved March 4, 2011.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed March 9, 2011
- Johnson, Daniel M. et al. (1985). Atlas of Oregon Lakes. Corvallis: Oregon State University Press. pp. 136–37. ISBN 0-87071-343-4.
- Oregon Atlas & Gazetteer (Map) (1991 ed.). DeLorme Mapping. § 22, 30–31. ISBN 0-89933-235-8.
- "Williamson River Delta". The Nature Conservancy. 2011. Retrieved March 5, 2011.