Protecting Public Health and the Environment.

Blackfoot River Subbasin

Subbasin at a Glance

Hydrologic Unit Code 17040207
Size 1,000 square miles (640,000 acres)

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

Angus Creek; Bacon and Upper Bacon Creek; Bear Canyon; Bear Creek; Blackfoot River; Brush Creek; Cabin Creek; Campbell Canyon; Cedar Creek; Chicken Creek; Collett Creek; Corrailsen Creek; Corral Creek; Coyote Creek; Crooked Creek; Daves Creek; Deadman Creek; Diamond Creek; Dry Valley Creek; Goodheart Creek; Grave Creek; Grizzly Creek; Jones Creek; Lanes Creek; Little Blackfoot River; Lower, Middle, and Upper Diamond Creeks; Lower Chippy Creek; Lower Johnson Creek; Lower, Middle, and Upper Sheep Creeks; Maybe Creek; Meadow Creek; Poison Creek; Rasmussen Creek; Rawlins Creek; Sawmill Creek; Slug Creek; State Land Creek; Stewart Canyon; Sunday Creek; Thompson Creek; Timber Creek; Trail Creek and tributaries; Trail Creek side channel; Upper and Lower Angus Creeks; Upper and Lower Kendall Creek; Upper Trail Creek; Warbonnet Creek; Wolverine Creek; Wood Creek

Beneficial Uses Affected Cold water aquatic life, salmonid spawning

Major Land Uses

Dryland and irrigated agriculture, livestock grazing, phosphate mining
Date Approved by EPA April 2002
EPA Approval Letter
Date Addendum Approved by EPA

December 2007
EPA Approval Letter

Date Addendum Approved by EPA October 2013
EPA Approval Letter

Subbasin Characteristics

The Blackfoot River subbasin is located in southeast Idaho. Historically, these water bodies sustained several beneficial uses. All streams supported cold water aquatic life, agriculture water supply, and secondary contact recreation. The bigger streams also supported primary contact recreation and most streams maintained spawning populations of salmonids. Domestic water supply is a designated use in the Blackfoot River above the reservoir. Current information suggests that some beneficial uses, such as cold water aquatic life and salmonid spawning, are impaired and not fully supported in several streams in the subbasin.

Sources of pollutant input above natural levels have been identified from various reports. Sediment input has been caused by agricultural and livestock practices, changes in the natural hydrograph, roads, mining activities, and mass wasting (e.g., landslides). Agriculture, grazing, and recreation (human wastes linked to camping areas) have been associated with nutrient input into Blackfoot River subbasin streams.

2001 Subbasin Assessment and TMDL

TMDLs were developed for sediment and nutrients. The US Environmental Protection Agency considers certain unnatural conditions, including flow alteration, that are not the result of the discharge of a specific pollutant as "pollution." Since a TMDL is not required for a water body impaired by pollution, but not a specific pollutant, a TMDL was not developed for flow alteration.

2001 TMDL: Streams and Pollutants for Which TMDLs Were Developed

Blackfoot River
Sediment, nutrients
Wolverine Creek
Sediment, nutrients
Jones Creek
Sediment, nutrients
Brush Creek
Sediment
Slug Creek
Sediment
Dry Valley Creek
Sediment
Angus Creek
Sediment
Lanes Creek
Sediment
Diamond Creek
Sediment

2007 Addendum

This document addresses temperature impairment in Brush Creek. The Brush Creek watershed is in the northern portion of the Blackfoot River subbasin. Potential natural vegetation temperature TMDLs were developed for two assessment units of Brush Creek. The goal of these TMDLs is to restore riparian vegetation to natural levels, thereby increasing stream shading and lowering stream temperatures.

2007 Addendum: Streams and Pollutants for Which TMDLs Were Developed

Brush Creek
Temperature

2013 Addendum

In the Blackfoot River subbasin, 54 assessment units (AUs) were listed as impaired in Category 5 of the 2010 Integrated Report. The causes include sediment (23 AUs), bacteria (22 AUs), selenium (17 AUs), dissolved oxygen (2 AUs), temperature (11 AUs), and combined biota/habitat bioassessments (4 AUs). This document addresses all of those sediment, bacteria, dissolved oxygen, and combined biota/habitat bioassessments and two of the temperature listings on 44 of the AUs.

2013 Addendum: Streams and Pollutants for Which TMDLs Were Developed

Deadman Creek
            Sediment
Grave Creek
            Sediment
Warbonnet Creek
            Sediment, E. coli
Wood Creek
            Sediment
Coyote Creek
            Sediment
Sunday Creek
            Sediment
Corral Creek
            E. coli
Chicken Creek
            Sediment
Bear Creek
            Sediment
Sawmill Creek
            E. coli
Thompson Creek
            Sediment, E. coli
Collett Creek
            Sediment, E. coli
Poison Creek
            Sediment, E. coli
Little Blackfoot River
            Sediment
State Land Creek
            Sediment
Blackfoot River         
            Temperature (also addresses dissolved oxygen)
Lower Johnson Creek
            Sediment
Goodheart Creek
            Sediment
Diamond Creek
            E. coli
Lower Chippy Creek
            Sediment
Angus Creek
            E. coli
Clarks Cut
            Turbidity (informational TMDL only)
Crooked Creek
            Sediment
Rawlins Creek
            Sediment, E. coli
Cedar Creek
            Sediment, E. coli
Jones Creek
            Sediment

Subbasin Documents


Staff Contacts

Water Quality Manager
Lynn Van Every
DEQ Pocatello Regional Office
444 Hospital Way #300
Pocatello, ID 83201
(208) 236-6160
lynn.vanevery@deq.idaho.gov