Protecting Public Health and the Environment.

Curlew Valley Subbasin

Subbasin at a Glance

Hydrologic Unit Code 16020309
Size 2,260 sq. miles (1,446,239 acres)

Water Bodies with EPA-Approved TMDLs (Category 4a)


Beneficial Uses Affected Cold Water Aquatic Life, salmonid spawning, primary contact recreation, and secondary contact recreation
Major Land Uses Rangeland, agriculture 
Date Approved by EPA July 2019
EPA Approval Letter

Subbasin Characteristics

The Curlew Valley subbasin is located in southeast Idaho and northern Utah. Streams located in the Idaho portion of the drainage flow out of the North Hansel Mountains and the Black Pine Mountains that bound the Curlew Valley and south into Utah. The Curlew Valley subbasin in Idaho is mainly contained in Oneida County with a small portion of the northern basin encompassed by Power County. A portion of the western basin is within Cassia County. The subbasin is sparsely populated, contains no cities, and has only two unincorporated communities, Holbrook and Stone.

2019 Subbasin Assessment and TMDL

This subbasin assessment and TMDL addresses waterbodies in the Curlew Valley subbasin that are listed in Category 5 of Idaho’s most recent Integrated Report. This document established bacteria (E. coli) and total suspended solids TMDLs on four assessment units. The TMDL analysis establishes water quality targets and load capacities, estimates existing pollutant loads, and allocates load reductions needed to return listed waters to a condition meeting water quality standards

2019 TMDL: Stream and Pollutants for Which TMDLs Were Developed

North Canyon
Total suspended solids
Sheep Creek
Total suspended solids, E. coli
Meadow Brook Creek
Total suspended solids, E. coli
Rock Creek (Curlew Valley)
Total suspended solids, E. coli

Subbasin Documents

Staff Contacts

Water Quality Scientist
DEQ Pocatello Regional Office
444 Hospital Way #300
Pocatello, ID 83201
(208) 239-5010

Related Pages

Total Maximum Daily Loads (TMDLs): Water Quality Improvement Plans

Table of Subbasin Assessments, TMDLs, Implementation Plans, and Five-Year Reviews

Frequently Asked Questions about Subbasin Assessments and TMDLs