Lamar River

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Lamar River
The Lamar River in 1998 showing trees burned in the 1988 wildfires
Country United States
State Wyoming
 - left Soda Butte Creek
 - right Slough Creek
 - location Absaroka Range, Wyoming
 - coordinates 44°21′19″N 109°49′33″W / 44.35528°N 109.82583°W / 44.35528; -109.82583 [1]
Mouth Yellowstone River
 - location Tower Junction, Wyoming
 - coordinates 44°55′45″N 110°24′07″W / 44.92917°N 110.40194°W / 44.92917; -110.40194Coordinates: 44°55′45″N 110°24′07″W / 44.92917°N 110.40194°W / 44.92917; -110.40194 [1]
Length 40 mi (64 km)

The Lamar River is a tributary of the Yellowstone River, approximately 40 miles (48 km) long, in northwestern Wyoming in the United States. The river is located entirely within Yellowstone National Park.


Prior to the 1884–85 Geological Survey of the park, the Lamar was known as the East Fork of the Yellowstone River. During that survey, Geologist Arnold Hague named the river for L.Q.C. (Lucius Quinctius Cincinnatus) Lamar,[2] then Secretary of the Interior (March 1885 – January 1888). The Lamar Valley, or the Secluded Valley of Trapper Osborne Russell and other park features or administrative names which contain Lamar are derived from this original naming.[3]

Osborne Russell in his 1921 Journal of a Trapper described the Lamar as follows:

Chapter-VI-In the Yellowstone Country-A Garden of Eden Inhabited By a Small Party of Snake Indians - On the 28th [July 1834] we crossed the mountain in a westerly direction through the thick pines and fallen timber, about twelve miles, and encamped in a small prairie about a mile in circumference. Through this valley ran a small stream in a northerly direction, which all agreed in believing to be a branch of the Yellowstone. 29th-We descended the stream about fifteen miles through the dense forest and at length came to a beautiful valley about eight miles long and three or four wide, surrounded by dark and lofty mountains. The stream, after running through the center in a northwesterly direction, rushed down a tremendous canyon of basaltic rock apparently just wide enough to admit its waters. The banks of the stream in the valley were low and skirted in many places with beautiful cottonwood groves. Here we found a few Snake Indians comprising six men, seven women and eight or ten children, who were the only inhabitants of the lonely and secluded spot.

— Osborne Russell, Journal of a Trapper,1921[4]

In 1869, the Cook–Folsom–Peterson Expedition encountered the Lamar River (East Fork) just upstream from the canyon section flowing into the Yellowstone and traveled upstream to the confluence of Calfee Creek where they camped on September 16, 1869.[5]

Location and tributaries[edit]

A black and gray female wolf on the roadway near the Lamar River bridge
A herd of bisons and pronghorns in Lamar Valley

It rises in the Absaroka Range, on the eastern edge of the park, and flows northwest through the northeast corner of the park. It is joined by many tributary streams, including Soda Butte Creek and Slough Creek and joins the Yellowstone near Tower Junction, just below the Grand Canyon of the Yellowstone.

The river is a popular destination for fly fishing,[6][7] and is widely known as one of the best places in Yellowstone National Park to view wildlife, especially grizzly bears and wolves. Three locations in the valley—Soda Butte, Crystal Creek and Rose Creek were the sites for the 1995 re-introduction of wolves into Yellowstone.[8] The river flows through a portion of the park hit hard by the 1988 wildfires.


The Lamar River, with its tributaries, is one of the most popular fishing areas in Yellowstone Park. The access is very easy and the cutthroat fishing is some of the best in the world. There are some rainbow trout in the river below the road bridge, but the primary fishing throughout the drainage is for Yellowstone cutthroat trout. Cutthroat trout in the Lamar offer good dry fly fishing with heavy hatches of caddis, pale morning duns, and large Green Drakes in July. Terrestrials are prominent in late summer.[9][10] The Lamar and its tributaries are not usually fishable until about the second week of July, because of high water, so check conditions by contacting local fly stores. The National Park Service has made frequent changes to the regulations for the Lamar and for its tributaries including Slough Creek and Soda Butte, and in 2018 has made significant new changes. Anglers are now required to kill all non-native fish, including rainbow trout, brook trout, and identifiable rainbow/cutthroat hybrids throughout the Lamar drainage. On page 14 of the 2018 regulations they still say that if it has a red slash put it back, but that is clearly superseded by the region specific requirement that if a fish landed in the Lamar drainage is clearly identifiable as a hybrid then it must be killed, even if it has a red slash, with the caveat that "if you don't know, let it go." Another significant change to the Park-wide fishing regulations is that felt soles are no longer permitted on waders. Other Park-wide regulations, that continue from previous years, are that barbed hooks, lead weights, lead split shot, and live bait are banned.[11]


See also[edit]


  1. ^ a b U.S. Geological Survey Geographic Names Information System: Lamar River, USGS GNIS
  2. ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Government Printing Office. p. 180. 
  3. ^ Haines, Aubrey L. (1996). Yellowstone Place Names-Mirrors of History. Niwot, Colorado: University Press of Colorado. pp. 106–107. ISBN 0-87081-382-X. 
  4. ^ Russell, Osborne (1921). Journal of a Trapper-Nine Years in the Rocky Mountains (1834-1843). Boise, Idaho: Symes-York Company. p. 31. 
  5. ^ Cook, Charles W.; Folsom, Dave E.; Peterson, William (1965). Haines, Aubrey L., ed. The Valley of the Upper Yellowstone-An Exploration of the Headwaters of the Yellowstone River in the Year 1869. Norman, OK: University of Oklahoma Press. pp. 26–27. 
  6. ^ Mathews, Craig; Molinero, Clayton (1997). The Yellowstone Fly-Fishing Guide—An authoritative guide to the waters of Yellowstone National Park. Guilford, CT: The Lyons Press. ISBN 1-55821-545-X. 
  7. ^ Parks, Richard (1998). Fishing Yellowstone National Park. Helena, MT: Falcon Press. ISBN 1-56044-625-0. 
  8. ^ Phillips, Michael K and Smith Douglas W. (1997). Yellowstone Wolf Project-Biennial Report 1995-96 (PDF) (Report). National Park Service. 
  9. ^ Parks, Richard (1998). Fishing Yellowstone National Park. Helena, MT: Falcon Press. pp. 190–94. ISBN 1-56044-625-0. 
  10. ^ Mathews, Craig; Molinero, Clayton (1997). The Yellowstone Fly-Fishing Guide-A authoritative guide to the waters of Yellowstone National Park. Guilford, CT: The Lyons Press. pp. 77–81. ISBN 1-55821-545-X. 
  11. ^ "Fishing in Yellowstone's Northeast". National Park Service. Retrieved 2017-05-26.