Klamath Basin - Distribution of Subwatersheds

Distribution of Subwatersheds

The drainage basins of the Williamson and Sprague Rivers, in Oregon, are to the north and northeast of Upper Klamath Lake. Together, the two watersheds cover 3,069 square miles (7,950 km2), or 19.4% of the Klamath River watershed. The basin of the Lost River, the largest subwatershed by area, lies to the southeast of Upper Klamath Lake and to the east of Lower Klamath Lake. This covers 3,009 square miles (7,790 km2) or 19.1% of the Klamath River watershed - nearly as much as the Williamson and Sprague. Proceeding west, the adjoining Butte Creek, Shasta, Scott and Salmon River watersheds have 603 square miles (1,560 km2), 795 square miles (2,060 km2), 813 square miles (2,110 km2), and 750 square miles (1,900 km2), respectively. These account for 4.3%, 5%, 5.2%. and 5% of the Klamath River watershed, respectively, or 19.5% of the watershed if put together.

Further southwest, the watershed of the Trinity River, the second largest subwatershed of the Klamath, has 2,965 square miles (7,680 km2) or 19% of the watershed. The watershed of the South Fork Trinity River is 980 square miles (2,500 km2) - 33% of the Trinity watershed or 6% of the Klamath watershed. The primary tributaries of the Klamath together account for 77% of the total Klamath watershed - the remaining land area is drained by smaller tributaries such as Jenny Creek, Fall Creek and Blue Creek.

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