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Green Mountain Reservoir water level

Reservoir, Colorado, United States

Directions

Right now

Very low for mid-October

Surface elevation

7,827.01ft Down 1.86 ft over the last 7 days

Water stored
15,291 acre‑ft
7,850 7,900 7,950

History

History
7,8507,900ftOct 12Oct 13Oct 14Oct 15Oct 177,8507,900ftOct 12Oct 14Oct 17
7,8507,9007,950ftSep 19Sep 26Oct 3Oct 10Oct 177,8507,9007,950ftSep 19Oct 3Oct 17
7,8507,9007,950ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20267,8507,9007,950ftOct 2025Apr 2026Oct 2026
7,8507,9007,950ftOct 2016Apr 2019Oct 2021Apr 2024Oct 20267,8507,9007,950ftOct 2016Oct 2021Oct 2026
7,8507,9007,950ftJanMarMayJulSepNov20267,8507,9007,950ftJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

Water is short at Green Mountain Reservoir: the latest reading of 7,827.01 ft is far below normal for mid-October.

That puts it 89.40 ft below the median of 7,916.41 ft for mid-October, based on 36 years of readings. A year ago it stood at 7,899.70 ft (−72.69 ft).

It is still going down, by 1.86 ft over the past week. With the water still dropping, the shoreline keeps moving out. The 30-day range is 7,827.01 ft – 7,833.76 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
7,916.41 ft89.40 ft below the median for this date
Normal for this date
7,897.68 ft – 7,937.39 ft8 years in 10 fall in this range (36 years of records)
Same day last year
7,899.70 ft−72.69 ft
Lowest and highest in 30 days
7,827.01 ft – 7,833.76 ft
Lowest and highest in 12 months
7,827.30 ft – 7,899.41 ft

Boating and fishing at Green Mountain Reservoir

At low levels, launching can mean a long walk or a closed ramp, and shallow points stick out further than charts suggest.

Conditions at the shore change with the level, so check with the agency that runs the lake before a trip.

Weather at the gauge

No rain in the last 3 days.

18 Sun 62° 27° – Wind 11 mph
19 Mon 60° 38° – Wind 18 mph
20 Tue 61° 40° 0.04 in Wind 9 mph
21 Wed 65° 40° – Wind 12 mph
22 Thu 65° 44° – Wind 7 mph
23 Fri 62° 38° – Wind 16 mph
24 Sat 58° 32° – Wind 10 mph

Forecast: Open-Meteo

Sunrise 07:19 AM Sunset 06:23 PM Daylight 11 hr, 3 min First quarter 53%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Blue River below Green Mountain ReservoirRiver gauge, Blue River 3.44 ft Below flood stage +0.01 ft 1.1 mi
Williams Fork near ParshallRiver gauge, Williams Fork 6.0 cfs Very low −0.3 cfs 11 mi
Williams Fork below Williams Fork ReservoirRiver gauge, Williams Fork 1.47 ft Below flood stage ±0 12 mi
Colorado River near KremmlingRiver gauge, Colorado River 3.99 ft Below flood stage −0.01 ft 13 mi
Williams Fork near LealRiver gauge, Williams Fork 1.43 ft Below flood stage +0.01 ft 14 mi
Piney River near State BridgeRiver gauge, Piney River 2.62 ft Below flood stage ±0 15 mi
Booth Creek near MinturnRiver gauge, Booth Creek 0.9 cfs Low −0.2 cfs 16 mi
South Fork of Williams Fork near LealRiver gauge, South Fork of Williams Fork 6.2 cfs Very low ±0 16 mi

Questions and answers

How does Green Mountain Reservoir compare with last year?

It is 72.69 ft lower than on the same day last year, when the reading was 7,899.70 ft.

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

The median for mid-October is 7,916.41 ft. In 8 years out of 10 the reading falls between 7,897.68 ft and 7,937.39 ft, based on 36 years of records.

Is Green Mountain Reservoir really 7,827.01 ft deep?

No. 7,827.01 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 Green Mountain Reservoir today?

On Oct 17, 2026, the surface elevation was 7,827.01 ft. Down 1.86 ft over the last 7 days.

Is Green Mountain Reservoir rising or falling?

Down 1.86 ft over the last 7 days.

Is the level of Green Mountain Reservoir normal?

Very 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:353 (Agency page)
Coordinates
39.87890, -106.31330 (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 7,827.01 ft 2026-10-17 06:00 Provisional
Water stored 15,291 acre‑ft 2026-10-17 06:00 Provisional

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How to cite

U.S. Bureau of Reclamation: Green Mountain Reservoir (usbr:353). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/colorado/green-mountain-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.