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Gibson Reservoir water level

Reservoir, Montana, United States

Directions

Low for mid-October

Surface elevation

4,612.77ft Down 1.70 ft over the last 7 days

Water stored
6,380 acre‑ft
4,625 4,650

History

4,6204,6404,660ftOct 12Oct 13Oct 14Oct 15Oct 174,6204,6404,660ftOct 12Oct 14Oct 17
4,6204,6404,660ftSep 19Sep 26Oct 3Oct 10Oct 174,6204,6404,660ftSep 19Oct 3Oct 17
4,6504,700ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20264,6504,700ftOct 2025Apr 2026Oct 2026
4,6004,6504,700ftOct 2016Apr 2019Oct 2021Apr 2024Oct 20264,6004,6504,700ftOct 2016Oct 2021Oct 2026
4,6004,6504,700ftJanMarMayJulSepNov20264,6004,6504,700ftJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

At 4,612.77 ft, Gibson Reservoir is below normal for mid-October.

That puts it 10.63 ft below the median of 4,623.40 ft for mid-October, based on 36 years of readings. A year ago it stood at 4,611.13 ft (+1.64 ft).

The level is falling, down 1.70 ft over the past week. With the water still dropping, the shoreline keeps moving out. Over the past 30 days it has moved between 4,612.77 ft and 4,620.94 ft.

Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt.

Compared with 36 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
4,623.40 ft10.63 ft below the median for this date
Normal for this date
4,610.44 ft – 4,663.07 ft8 years in 10 fall in this range (36 years of records)
Same day last year
4,611.13 ft+1.64 ft
Lowest and highest in 30 days
4,612.77 ft – 4,620.94 ft
Lowest and highest in 12 months
4,610.20 ft – 4,724.02 ft

Swimming and boating at Gibson Reservoir

Low water changes a lake fast for boaters. Some ramps get shorter or close, docks may be moved, and rocks and sandbars that are usually well under the surface come within reach of a prop.

If you swim, pick a spot with an easy way out, and remember that drop-offs move as the level changes.

Weather at the gauge

No rain in the last 3 days.

18 Sun 54° 40° – Wind 11 mph
19 Mon 67° 40° – Wind 8 mph
20 Tue 54° 42° – Wind 7 mph
21 Wed 66° 41° – Wind 14 mph
22 Thu 66° 46° 0.03 in, 44% Wind 12 mph
23 Fri 50° 33° 0.33 in, 50% Wind 6 mph
24 Sat 45° 26° 0.03 in, 35% Wind 6 mph

Forecast: Open-Meteo

Sunrise 07:55 AM Sunset 06:39 PM Daylight 10 hr, 44 min First quarter 53%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Sun River below Diversion Dam near Augusta MTRiver gauge, Sun River 214 cfs High +8.0 cfs 3.5 mi
South Fork Sun River near Augusta MTRiver gauge, South Fork Sun River 95.4 cfs Normal +3.3 cfs 5.2 mi
North Fork Sun River near Augusta MTRiver gauge, North Fork Sun River 3.42 ft Below flood stage ±0 5.3 mi
Pishkun Reservoir and DikesReservoir 4,349.24 ft Low 13 mi
Willow Creek ReservoirReservoir 4,129.13 ft Normal 16 mi
Sun River below Willow Cr near Augusta MTRiver gauge, Sun River 214 cfs High −5.0 cfs 19 mi
Teton River below South Fork near Choteau MTRiver gauge, Teton River 4.34 ft Below flood stage +0.01 ft 21 mi
Sun River at Simms MTRiver gauge, Sun River 2.84 ft Below flood stage −0.02 ft 39 mi

Questions and answers

How does Gibson Reservoir compare with last year?

It is 1.64 ft higher than on the same day last year, when the reading was 4,611.13 ft.

What is a normal level for Gibson Reservoir in mid-October?

The median for mid-October is 4,623.40 ft. In 8 years out of 10 the reading falls between 4,610.44 ft and 4,663.07 ft, based on 36 years of records.

Is Gibson Reservoir really 4,612.77 ft deep?

No. 4,612.77 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Gibson Reservoir today?

On Oct 17, 2026, the surface elevation was 4,612.77 ft. Down 1.70 ft over the last 7 days.

Is Gibson Reservoir rising or falling?

Down 1.70 ft over the last 7 days.

Is the level of Gibson Reservoir normal?

Low for mid-October. Compared with 36 years of daily readings for this time of year.

How often is this data updated?

The U.S. Bureau of Reclamation publishes a new reading once a day. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Bureau of Reclamation
Station code
usbr:342 (Agency page)
Coordinates
47.60080, -112.76170 (WGS84)
Update interval
once a day
Licence
Public domain. Data: U.S. Bureau of Reclamation (RISE), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Surface elevation 4,612.77 ft 2026-10-17 06:00 Provisional
Water stored 6,380 acre‑ft 2026-10-17 06:00 Provisional

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How to cite

U.S. Bureau of Reclamation: Gibson Reservoir (usbr:342). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/montana/gibson-reservoir

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer