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Hi3 Water

Idaho Water Assets

Pacific Northwest

Idaho's water resources include the Snake River Plain Aquifer — one of the largest and most productive aquifers in North America — with active conjunctive management.

Prior Appropriation45 counties tracked2188 active alerts
81,790
Total Assets
55.8
Avg WIS
49,694
Verified
2
High WIS (75+)

Idaho Water Intelligence Report

Hi3 Water tracks 81,790 water assets across Idaho, spanning 45 counties and 8 distinct asset types. The average Water Intelligence Score (WIS) across Idaho is 55.8/100, with 2 assets scoring in the high-value range (75+). Idaho operates under Prior Appropriation water law, which directly affects water rights acquisition and asset valuation in this state.

The dominant water asset type in Idaho is River (44,307 assets, avg WIS 65.9). The highest concentration is in Ada County with 4,002 tracked assets.

2,188 active regulatory alerts are currently tracked in Idaho, including EPA violations, drought declarations, and state water board enforcement actions. Always check the regulatory intelligence for any asset before making acquisition decisions.

Data sources: USGS Water Data, EPA ECHO, state water boards, and verified field reports. Water Intelligence Scores are computed across flow rate, geological stability, legal accessibility, sustainability, and rarity. Report last updated: August 23, 2026.

Asset Types in Idaho

River
44,307
Avg WIS 65.9
Well
30,970
Avg WIS 43.9
Lake
4,116
Avg WIS 42.3
Spring
1,641
Avg WIS 43.2
Reservoir
681
Avg WIS 52.8
Glacier
71
Avg WIS 42.2
Aquifer
3
Avg WIS 79.3
Fossil Water
1
Avg WIS 83.0

Intelligence Grade Distribution

How Idaho assets are graded

S (≥90) — Exceptional1 (0.0%)
A (75-89) — Excellent1 (0.0%)
B (55-74) — Good43,093 (52.7%)
C (35-54) — Fair38,695 (47.3%)
D (<35) — Limited0 (0.0%)

Regulatory Alerts

Drought, EPA violations, and enforcement actions affecting Idaho

84
critical
35
high
2029
medium
40
low
0
info
NINEMILE CREEK AB MOUTH AT WALLACE, ID — Gage Height 12.9 ft
usgs_flood · flood_warning
CANYON CREEK AB MOUTH AT WALLACE, ID — Gage Height 20.3 ft
usgs_flood · flood_warning
NF COEUR D ALENE RIVER AT ENAVILLE ID — Gage Height 57.6 ft
usgs_flood · flood_warning

Top Counties in Idaho

Ada
4,002 assetsWIS 42
Canyon
2,157 assetsWIS 42
Twin Falls
1,262 assetsWIS 43
Butte
1,194 assetsWIS 46
Jerome
1,159 assetsWIS 42
Bingham
1,093 assetsWIS 43
Gooding
1,089 assetsWIS 42
Cassia
969 assetsWIS 43
Jefferson
877 assetsWIS 42
Fremont
732 assetsWIS 44
Elmore
697 assetsWIS 43
Blaine
633 assetsWIS 43

Aquifer Type Mix

unconfined
413
Avg WIS 47
confined
245
Avg WIS 55
fossil
1
Avg WIS 83

Top 10 Water Assets in Idaho

Ranked by Water Intelligence Score — Idaho's highest-scoring springs, wells, and aquifers.

View all on map
  1. 1

    Snake River Artesian Belt — Deep Aquifer

    Aquifer
    Twin Falls County County·800 GPM
    94
    WIS
  2. 2

    Snake River Plain Deep Basalt Fossil Aquifer

    Fossil Water
    Minidoka County·2,000 GPM
    83
    WIS
  3. 3

    Eastern Snake River Plain Aquifer — Twin Falls Region

    Aquifer
    Twin Falls County·3,000 GPM
    72
    WIS
  4. 4

    Spokane Valley-Rathdrum Prairie Aquifer

    Aquifer
    Kootenai County·5,000 GPM
    72
    WIS
  5. 5

    Brundage

    Reservoir
    ·161,579 GPM
    70
    WIS
  6. 6

    Francis

    Reservoir
    ·98,743 GPM
    70
    WIS
  7. 7

    Slack

    Reservoir
    ·41,292 GPM
    69
    WIS
  8. 8

    Middle Fork Salmon River

    River
    ·445,398 GPM
    69
    WIS
  9. 9

    Bar Creek

    River
    ·4,331 GPM
    69
    WIS
  10. 10

    Standard Creek

    River
    ·13,695 GPM
    69
    WIS
Avg Flow Rate
289,470 GPM
Avg Depth
257 ft
For Sale
3
Fossil Water
1

Explore Idaho on the Interactive Map

View all 81,790 water assets, aquifer boundaries, water rights data, and regulatory alerts for Idaho.

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