basin occupies portions of Jackson, Lake, and Klamath counties; in California, it flows through the counties of Siskiyou, Modoc, Trinity, Humboldt, and Del Norte (NRCS 2006).

For discussion and management, the Klamath basin is divided into the upper and lower Klamath basins. The generally accepted boundary between the two is Iron Gate Dam on the Klamath River. All lands upstream (that is, east and west) of the dam are within the upper Klamath basin (area: 8,060 mi2); and those below (that is, south and west of) the dam comprise the lower Klamath basin (area: 7,628 mi2). The lands within the upper basin fall within the U.S. Bureau of Reclamation (USBR) Klamath Project. A number of sub-basins are present throughout the watershed (Table 2-1). A large portion of the upper basin is in agriculture and rangeland use, whereas in the lower basin, forest land dominates the landscape with the exception of the Scott and Shasta basins which have large portions of area in agriculture and rangeland (Figure 2-1).

The largest towns in the basin are Klamath Falls, Oregon, which has a total metropolitan population of about 42,000 (City of Klamath Falls 2007); Yreka, CA (7,300), (Yreka Chamber of Commerce 2007); and Weaverville, California (3,550) (City-Data.com 2007). The basin is home to six federally recognized American Indian tribes: Yurok, Hoopa Valley, Karuk, Quartz Valley, Resighini (all in California) and the Klamath in Oregon.

TABLE 2-1 Klamath Basin Sub-basins Shown in Figure 2-1

USGS Identification

Name

Area in acres

 

Upper Klamath Basin

 

18010201

Williamson River

934,490

18010202

Sprague River

1,029,824

18010203

Upper Klamath Lake

464,903

18010204

Lost River

1,926,303

18010205

Butte Creek

386,034

18010206E

Upper Klamath, East Section

416,786

Upper Klamath Basin Total (acres; sq mi)

5,158,340; 8,060

 

Lower Klamath Basin

 

18010206W

Upper Klamath, West Section

489,887

18010207

Shasta River

508,841

18010208

Scott River

520,612

18010209

Lower Klamath River

984,709

18010210

Salmon River

480,178

18010211

Trinity River

1,303,253

18010212

South Fork Trinity River

594,895

Lower Klamath Basin Total (acres; sq mi)

4,882,015; 7,628

SOURCE: Modified from NRCS 2006.



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