The Rio del Oso is an intermittent stream in

Rio Arriba County, New Mexico Rio Arriba County is a county in the U.S. state of New Mexico. As of the 2010 census, the population was 40,246. Its county seat is Tierra Amarilla. Its northern border is the Colorado state line. Rio Arriba County comprises the Española, N ...

. It is tributary to the

Rio Chama The Rio Chama, a major tributary river of the Rio Grande, is located in the U.S. states of Colorado and New Mexico. The river is about long altogether. From its source to El Vado Dam its length is about , from El Vado Dam to Abiquiu Dam is about ...

after crossing under

U.S. Route 84 U.S. Route 84 (US 84) is an east–west U.S. Highway that started as a short Georgia–Alabama route in the original 1926 scheme. Later, in 1941, it had been extended all the way to Colorado. The highway's eastern terminus is a short distan ...

near

Chili, New Mexico Chili is an unincorporated community and census-designated place in Rio Arriba County, New Mexico. Its population was 654 as of the 2010 census. U.S. Route 84 passes through the community. The name comes from a station of the D&RG railroad that wa ...

(in zip code 87537 between Hernandez and Medanales). The alluvial record in the lower valley of the Rio del Oso is well dated and is unusual in that it includes a single Holocene terrace, a few thousand years old.Hall, Stephen A., and Richard D. Periman
"Unusual holocene alluvial record from Rio Del Osos, Jemez Mountains, New Mexico: Paleoclimatic and archaeologic significance."
In In: Barry S. Kues, Shari A. Kelley, and Virgil W. Lueth, eds. ''Geology of the Jemez Mountains Region II''; 58th Field conference, New Mexico Geological Society. Socorro, NM: New Mexico Bureau of Geology and Mine Resources: 459–468. 2007.

References

Rivers of New Mexico {{NewMexico-river-stub