Hungry Horse Dam · South Fork Flathead River · MT
Hungry Horse Reservoir
The Columbia system's cold-water bank in Montana — another reservoir where the USGS gage and Reclamation's record cross-check each other.
Water surface elevation
3,544.6 ft
USGS gage, 15-minute · Sep 30, 11:45 PM MDT
Water in storage
3.12 million acre-feet
Bureau of Reclamation, daily · daily value, Sep 29
Share of capacity
89.9% full
against the project figure capacity figure (USBR Hungry Horse project data)
Below full pool
15.4 ft
full pool at 3,560.0 ft
This month in the record
lower than 43% of the 75 Octobers on record
monthly mean storage; record low 74,528 acre-feet (1951), record high 3.49 million acre-feet (1959)
30-day trend
-4,147 af/day
storage, 2026-08-17 → 2026-09-16; over the year -134 af/day. Measured change, not a forecast.
Drought at the dam
none this week
US Drought Monitor at the dam's coordinates, released 2026-09-17; the feeding basin can differ.
89.9% full
of capacity, by storage (project figure figure, USBR Hungry Horse project data). Sedimentation slowly shrinks real capacity.
The water line is elevation (USBR project datum); the percentage is storage ÷ capacity. They are different measures — a reservoir's volume is not linear in its depth, so the line's height in this column is not the percentage.
Snowpack in the feeding basin
Measured across the Flathead headwaters.
Snow season
typically Oct 20 – Jun 18
0 in on the ground, 2026-09-29; median peak 25.2 in around Apr 24
Last winter's verdict
104% of median peak
water year 2026 — the snow that fed this year's pool
5 highest active SNOTEL stations in the basin (Barker Lakes, Saddle Mtn., Warm Springs, …), NRCS AWDB REST (SNOTEL), station set pinned 2026-09-17. Daily snow-water equivalent against the stations' own 30-year medians; off season the percent is withheld rather than divided by zero.
The last 119 days
Daily water-surface elevation in feet. The axis hugs the data — it does not start at zero. Source: USGS NWIS daily values.
See the numbers as a table
| Date | Elevation (ft) |
|---|---|
| Sep 29 | 3544.78 |
| Sep 28 | 3545.01 |
| Sep 27 | 3545.21 |
| Sep 26 | 3545.40 |
| Sep 25 | 3545.65 |
| Sep 24 | 3545.85 |
| Sep 23 | 3546.02 |
| Sep 22 | 3546.23 |
| Sep 21 | 3546.42 |
| Sep 20 | 3546.62 |
| Sep 19 | 3546.80 |
| Sep 18 | 3546.98 |
| Sep 17 | 3547.14 |
| Sep 16 | 3547.33 |
| Sep 15 | 3547.46 |
| Sep 14 | 3547.64 |
| Sep 13 | 3547.81 |
| Sep 12 | 3547.96 |
| Sep 11 | 3548.12 |
| Sep 10 | 3548.18 |
| Sep 9 | 3548.42 |
| Sep 8 | 3548.57 |
| Sep 7 | 3548.64 |
| Sep 6 | 3548.72 |
| Sep 5 | 3548.82 |
| Sep 4 | 3549.08 |
| Sep 3 | 3549.27 |
| Sep 2 | 3549.44 |
| Sep 1 | 3549.66 |
| Aug 31 | 3549.85 |
Most recent 30 days shown.
The whole record
Monthly mean elevation, Oct 1951 to Sep 2026. The axis spans the pools, not zero; elevations in USBR project datum. Months with fewer than 15 gaged days are dropped, and gaps in the record break the line. Source: USBR RISE, retrieved 2026-09-17.
See the numbers as a table
| Month | Mean elevation (ft) | Days gaged |
|---|---|---|
| Sep 2026 | 3548.4 | 16 |
| Aug 2026 | 3553.0 | 31 |
| Jul 2026 | 3558.4 | 31 |
| Jun 2026 | 3558.1 | 29 |
| May 2026 | 3548.8 | 30 |
| Apr 2026 | 3545.3 | 30 |
| Mar 2026 | 3541.2 | 31 |
| Feb 2026 | 3539.3 | 28 |
| Jan 2026 | 3545.6 | 31 |
| Dec 2025 | 3547.3 | 31 |
| Nov 2025 | 3541.3 | 30 |
| Oct 2025 | 3543.8 | 31 |
| Sep 2025 | 3549.6 | 30 |
| Aug 2025 | 3554.5 | 31 |
| Jul 2025 | 3557.8 | 31 |
| Jun 2025 | 3553.1 | 30 |
| May 2025 | 3534.9 | 31 |
| Apr 2025 | 3519.7 | 30 |
| Mar 2025 | 3510.5 | 31 |
| Feb 2025 | 3514.6 | 28 |
| Jan 2025 | 3521.9 | 31 |
| Dec 2024 | 3527.7 | 31 |
| Nov 2024 | 3532.8 | 30 |
| Oct 2024 | 3538.5 | 31 |
Most recent 24 months shown; the full monthly series is in the page's API response.
Storage against capacity
Monthly mean storage in acre-feet, zero baseline. The dashed line is the project figure capacity figure (USBR Hungry Horse project data) — sedimentation slowly shrinks real capacity. Storage can legitimately rise past a conservation-pool line when the flood pool is in use.
See the numbers as a table
| Month | Mean storage (acre-feet) | Days gaged |
|---|---|---|
| Sep 2026 | 3,199,581 | 16 |
| Aug 2026 | 3,303,983 | 31 |
| Jul 2026 | 3,428,995 | 31 |
| Jun 2026 | 3,421,978 | 29 |
| May 2026 | 3,207,383 | 30 |
| Apr 2026 | 3,128,360 | 30 |
| Mar 2026 | 3,038,285 | 31 |
| Feb 2026 | 2,996,839 | 28 |
| Jan 2026 | 3,136,852 | 31 |
| Dec 2025 | 3,173,539 | 31 |
| Nov 2025 | 3,039,731 | 30 |
| Oct 2025 | 3,095,928 | 31 |
| Sep 2025 | 3,224,430 | 30 |
| Aug 2025 | 3,337,449 | 31 |
| Jul 2025 | 3,414,761 | 31 |
| Jun 2025 | 3,306,773 | 30 |
| May 2025 | 2,903,856 | 31 |
| Apr 2025 | 2,592,200 | 30 |
| Mar 2025 | 2,416,373 | 31 |
| Feb 2025 | 2,493,463 | 28 |
| Jan 2025 | 2,636,391 | 31 |
| Dec 2024 | 2,753,984 | 31 |
| Nov 2024 | 2,859,131 | 30 |
| Oct 2024 | 2,980,976 | 31 |
Most recent 24 months shown.
Where these numbers come from
Readings at Hungry Horse Reservoir are the measuring agencies' own: each value above names its source (USGS gage, Bureau of Reclamation daily record, Army Corps project data, or this desk's committed copy) and its observation time in the reservoir's own time zone. The capacity figure is the project figure USBR Hungry Horse project data number; sedimentation slowly shrinks real capacity, so the vintage travels with the percent.