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| | USGS Oklahoma District OFR 58-63 Report Abstract (Site not responding. Last check: 2007-10-22) |
 | | The average gradient of the Washita River is about 3.7 feet per mile, beginning with an elevation of about 2,800 feet at its source, and ending with an elevation of about 510 feet at its mouth. |
 | | The 7,482 square miles of the basin in Oklahoma is in the 17 counties of Roger Mills, Beckham, Comanche, Grady, Stephens, McClain, Custer, Washita, Caddo, Kiowa, Garvin, Carter, Bryan, Murray, Pontotoc, Johnston and Marshall. |
 | | In Texas and at the western edge of Oklahoma the Washita flows in a valley cut in rocks of the High Plains; much of the coarse gravel and sand of the alluvium is derived from these rocks. |
| ok.water.usgs.gov /abstracts/ofr58-63.html (352 words) |
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