Protecting Public Health and the Environment.

Boise River (North/Middle Fork) Subbasin

Subbasin at a Glance

Hydrologic Unit Code 17050111
Size 759 square miles (486,036 acres)
Beneficial Uses Affected Cold water aquatic life, salmonid spawning, primary and secondary contact recreation, domestic water supply

Major Land Uses

Forestry, roads, mining, agriculture/livestock, recreation
Date Approved by EPA Subbasin assessment only; not subject to EPA approval

Subbasin Characteristics

The North/Middle Fork Boise River subbasin is located in southwest Idaho between Boise and Stanley. The subbasin includes the North and Middle Fork Boise River and all tributaries upstream from the confluence of the North and Middle Forks of the Boise River. The subbasin area is primarily federally owned and administered. Atlanta is the only recognized community in the watershed with year-round residents. Access is provided primarily by US Forest Service-maintained roads and by county-owned or county-maintained roads.

2002 Upper Boise River Watershed Assessment

Watershed at a Glance

The Upper Boise River watershed is made up of two subbasins, as summarized in the table below.

Hydrologic Unit Codes

17050111 (North/Middle Fork Boise River Subbasin)
17050113 (South Fork Boise River Subbasin)

Size 2,033 square miles (1,301,120 acres)
Beneficial Uses Affected Cold water aquatic life, salmonid spawning, primary and secondary contact recreation, domestic water supply

Major Land Uses

Forestry, roads, mining, agriculture/livestock, recreation

Located in southwest Idaho, the upper Boise River watershed is about 2,033 square miles of predominantly undeveloped forestland and open range with both managed and free-flowing streams. The upper Boise River watershed is comprised of the two hydrologic cataloging units of the Boise River system upstream of Arrowrock Reservoir. The waters of the subbasin join to form the Arrowrock Reservoir, which supplies water to Lucky Peak Reservoir and the lower Boise River.

This subbasin assessment found that all §303(d)-listed water bodies within the upper Boise River watershed are currently fully supporting all of their beneficial uses and are no longer candidates for TMDL development.

The subbasin assessment also lists water bodies not fully supporting their beneficial uses that should be added to the §303(d) list during the next listing cycle.

2002 Summary of Assessment Outcomes

On 1998 §303(d) List

Buck Creek
          Delist; no TMDL needed
Browns Creek
         Delist; no TMDL needed
Willow Creek
         Delist; no TMDL needed
South Fork Boise River
         Delist; no TMDL needed
Deer Creek
         Delist; no TMDL needed
Little Smoky Creek
         Delist; no TMDL needed
Cayuse Creek
         Delist; no TMDL needed
North Fork Feather Creek
         Delist; no TMDL needed
Smith Creek
         Delist; no TMDL needed
Rattlesnake Creek
         Delist; no TMDL needed

Not on 1998 §303(d) List

Crooked River
         Add to §303(d) list for sediment
Beaver Creek
         Add to §303(d) list for sediment
Rabbit Creek
         Add to §303(d) list for unknown pollutant
Meadow Creek
         Add to §303(d) list for sediment
French Creek
         Add to §303(d) list for sediment
Little Camas Reservoir
         Add to §303(d) list for sediment

Subbasin Document


Staff Contacts

Water Quality Manager
Lance Holloway
DEQ Boise Regional Office
1445 N. Orchard St.
Boise, ID 83706
(208) 373-0550
lance.holloway@deq.idaho.gov

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