Anderson Ranch Reservoir water level
Reservoir, Idaho, United States
Right now
Normal for mid-October
Surface elevation
- Water stored
- 230,572 acre‑ft
History
202120222023202420252026
What this means
The lake level at Anderson Ranch Reservoir reads 4,150.54 ft, about where it usually sits at this time of year.
That puts it 3.09 ft below the median of 4,153.63 ft for mid-October, based on 36 years of readings. A year ago it stood at 4,153.45 ft (−2.91 ft).
It is still going down, by 0.46 ft over the past week. The 30-day range is 4,150.54 ft – 4,152.42 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
- 4,153.63 ft3.09 ft below the median for this date
- Normal for this date
- 4,078.84 ft – 4,180.23 ft8 years in 10 fall in this range (36 years of records)
- Same day last year
- 4,153.45 ft−2.91 ft
- Lowest and highest in 30 days
- 4,150.54 ft – 4,152.42 ft
- Lowest and highest in 12 months
- 4,150.61 ft – 4,196.14 ft
Boating and fishing at Anderson Ranch Reservoir
A lake in its usual range is what most ramps, docks and swimming areas are built for.
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.
Forecast: Open-Meteo
Map
Nearby gauges
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| Sf Boise River at Anderson Ranch DamRiver gauge, Sf Boise River | 304 cfs | Normal | +4.0 cfs | 1.8 mi |
| Sf Boise River near FeathervilleRiver gauge, Sf Boise River | 1.63 ft | Below flood stage | ±0 | 12 mi |
| Canyon Creek at Oregon Trail Xing near Mountain HomeRiver gauge, Canyon Creek | 0.0 cfs | Very low | ±0 | 14 mi |
| Boise River near Twin SpringsRiver gauge, Boise River | 300 cfs | Low | ±0 | 25 mi |
| Snake River at King HillRiver gauge, Snake River | 7,070 cfs | Very low | −200.0 cfs | 28 mi |
| Arrowrock ReservoirReservoir | 3,131.71 ft | Normal | 29 mi | |
| Lucky Peak LakeLake | 2,944.98 ft | Normal | 32 mi | |
| Mores Creek above Robie Creek near Arrowrock DamRiver gauge, Mores Creek | 1.85 ft | Below flood stage | +0.01 ft | 34 mi |
Questions and answers
How does Anderson Ranch Reservoir compare with last year?
It is 2.91 ft lower than on the same day last year, when the reading was 4,153.45 ft.
What is a normal level for Anderson Ranch Reservoir in mid-October?
The median for mid-October is 4,153.63 ft. In 8 years out of 10 the reading falls between 4,078.84 ft and 4,180.23 ft, based on 36 years of records.
Is Anderson Ranch Reservoir really 4,150.54 ft deep?
No. 4,150.54 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 Anderson Ranch Reservoir today?
On Oct 18, 2026, the surface elevation was 4,150.54 ft. Down 0.46 ft over the last 7 days.
Is Anderson Ranch Reservoir rising or falling?
Down 0.46 ft over the last 7 days.
Is the level of Anderson Ranch Reservoir normal?
Normal 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:3641(Agency page)- Coordinates
43.35951, -115.45017(WGS84)- Update interval
- once a day
- Licence
- Public domain. Data: U.S. Bureau of Reclamation (RISE), provisional data subject to revision
Published series
| Parameter | Last value | Time (UTC) | Quality |
|---|---|---|---|
| Surface elevation | 4,150.54 ft | 2026-10-18 06:00 | Provisional |
| Water stored | 230,572 acre‑ft | 2026-10-18 06:00 | Provisional |
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How to cite
U.S. Bureau of Reclamation: Anderson Ranch Reservoir (usbr:3641). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/idaho/anderson-ranch-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