June 13, 1805, at Great Falls, Cascade County, Montana.
Back dark olive; sides variable: silvery, olive, reddish to yellow-orange; belly lighter; dark spots on back, sides, and on median fins. Mouth extends beyond eye; bright red to red-orange slash mark on each side of throat, particularly visible in breeding males. Length: to 30 in (76 cm). Weight: to 41 lbs (18.6 kg).
Inshore marine and estuarine waters; lakes; coastal, inland, and alpine streams.
From southern Alaska to northern California; inland from southern British Columbia and Alberta south to New Mexico; eastern California to central Colorado. Introduced in western United States.
Three subspecies of the cutthroat trout are listed as threatened in the United States: the Lahontan in California, Nevada, Oregon, and Utah; the Paiute in California; and the greenback in Colorado.
There are more than 10 subspecies of cutthroat trout, locally called "native trout," which vary in coloration and size.