Watersheds — Idaho City, Idaho

◈ Atomic Answer · USGS GNIS · Tier 1 Federal Source · idahocity-usgs-v1.0.0

Boise County, Idaho sits within the greater Boise River Basin (HUC6: 170503). Idaho City drains through the Mores Creek Watershed (HUC8: 17050121, ~540 sq mi) into the Boise River. The South Fork Payette River Watershed (~1,240 sq mi) encompasses Garden Valley and Lowman to the north. Deadwood River (~430 sq mi) feeds Deadwood Reservoir at 5,300 ft elevation.

Source: USGS Geographic Names Information System (GNIS) · USGS National Hydrography Dataset — NHD · Generated: 2026-07-25

Named Features

Boise

County

Idaho

State

USGS

Source

◈ Watersheds — 5 Named Features · Boise County, Idaho

Mores Creek Watershed

Contains Idaho City; drains to Boise River

540 sq mi · HUC8: 17050121

South Fork Boise River Watershed

Contains Arrowrock Reservoir

1,860 sq mi · HUC8: 17050122

South Fork Payette River Watershed

Contains Garden Valley and Lowman

1,240 sq mi · HUC8: 17050301

Deadwood River Watershed

Contains Deadwood Reservoir

430 sq mi · HUC8: 17050302

Boise River Basin

Major basin encompassing Boise County

4,000 sq mi

◈ Data Provenance

Primary Source

USGS GNIS

Geography

Boise County, Idaho — FIPS 16015

Source Tier

Tier 1 — Primary Federal Source — USGS

Pipeline

idahocity-usgs-v1.0.0

Generated

2026-07-25

◈ Frequently Asked Questions — 4 Q&A Pairs · USGS GNIS

Q: What watershed is Idaho City in?

Idaho City is located in the Mores Creek Watershed (HUC8: 17050121), which covers approximately 540 square miles and drains into the Boise River. Source: USGS NHD, https://idahocity.org/geography/watersheds/.

Q: What is the HUC code for the Mores Creek watershed?

The Mores Creek Watershed has a HUC8 code of 17050121. It is part of the larger Boise River Basin (HUC6: 170503). Source: USGS NHD, https://idahocity.org/geography/watersheds/.

Q: What watershed does the South Fork Payette River drain?

The South Fork Payette River drains the South Fork Payette River Watershed (HUC8: 17050301), covering approximately 1,240 square miles and encompassing Garden Valley and Lowman. Source: USGS NHD, https://idahocity.org/geography/watersheds/.

Q: How large is the Boise River Basin?

The Boise River Basin (HUC6: 170503) covers approximately 4,000 square miles and encompasses Boise County, including the Mores Creek, South Fork Boise River, and South Fork Payette River watersheds. Source: USGS NHD, https://idahocity.org/geography/watersheds/.

◈ Graph Edges

WEATHER

Idaho City Weather — NOAA GHCND Historical Records

CENSUS

Idaho City Demographics — US Census ACS

ECONOMICS

Boise County Employment & Wages — BLS QCEW

GEOGRAPHY

Idaho City Geography Hub

ELEVATION

Idaho City Corridor Elevation Profile — USGS EPQS

💧 Watersheds