States

Nelson Reservoir

Montana · Reclamation gauge
2,2122,2142,216
Grey bar: 12-month range 2,211.0–2,217.2 ft.
Water level · NAVD88
2,215.89FT
Storage 56,419 acre-feet
The source publishes no % full figure.
7 days −0.16 ft30 days −0.72 ft
Reading for Oct 24, 2026 · page refreshed Oct 25, 21:16 UTC
Source: U.S. Bureau of Reclamation (RISE)
Worth going today?This Afternoon
Looks good
Light wind, dry
Wind10 mph
Rain0%
Temp48°F
Level2,215.9 ft
This AfternoonSunny · 48°F
E 10 mph · rain 0%
TonightMostly Clear · 24°F
E 10 mph · rain 0%
NWS forecast for the gauge location. Good = wind ≤ 10 mph and rain ≤ 30%; storms are flagged. Not safety advice – check local conditions, closures and warnings.

Level history

2,215.52,216.02,216.52,217.0ftSep 24Oct 2Oct 9Oct 16Oct 24
2,215.52,216.02,216.52,217.0ftSep 24Oct 9Oct 24
2,2122,2142,216ftDec 2025Mar 2026May 2026Aug 2026Oct 2026
2,2122,2142,216ftDec 2025May 2026Oct 2026

Field notes

As of Oct 24, 2026, Nelson Reservoir stood at 2,215.89 (NAVD88) ft.

Reclamation reports storage of 56,419 acre-feet for the same day.

Over the past 7 days the lake has been falling (−0.16 ft), and it is −0.72 ft over 30 days.

Readings come from the Bureau of Reclamation's daily reservoir data for Nelson Reservoir and Nelson Dikes.

Lake facts

Storage (latest)56,419 acre-feet
Gauge / stationNelson Reservoir and Nelson Dikes
Elevation datumft (NAVD88)
Gauge location48.5297, -107.5186

Nearby lakes

Fresno Reservoir111 mi W2,566.93 ft+0.03 ftLake Elwell164 mi W2,987.05 ft−0.26 ftE. Branch Short Creek Reservoir218 mi E · ND1,887.37 ft−0.15 ftWhite Earth Lake219 mi E · ND2,153.32 ft−0.02 ftBighorn River223 mi S3,188.57 ft+0.33 ft

Common questions

Is Nelson Reservoir rising or falling?

Over the last 7 days it changed −0.16 ft and over 30 days −0.72 ft.

How full is Nelson Reservoir?

Reclamation publishes the water surface elevation for this gauge but not a percent-full figure, so we don't show one rather than estimate it.

How often is this page updated?

The page is rebuilt automatically every day from Reclamation's published data. Values can be revised later by the source agency.

Where does the data come from?

The U.S. Bureau of Reclamation's RISE data portal (data.usbr.gov). Forecasts come from the National Weather Service.

Daily values published by the Bureau of Reclamation. Reclamation data are provisional and subject to revision unless otherwise noted. This page is not affiliated with or endorsed by the Bureau of Reclamation. See data sources.