Mann Lake and Reservoir A water level
Reservoir, Idaho, United States
Right now
Low for mid-October
Surface elevation
- Water stored
- 877 acre‑ft
History
202120222023202420252026
What this means
Mann Lake and Reservoir A is below normal for mid-October, with the lake level at 1,788.56 ft.
The median for mid-October is 1,790.09 ft, based on 33 years of readings, so the lake level is 1.53 ft below typical. On the same day last year the reading was 1,787.19 ft, a difference of +1.37 ft.
It has dropped 0.63 ft over the past week. With the water still dropping, the shoreline keeps moving out. In the last month it has stayed between 1,788.56 ft and 1,790.83 ft.
Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt.
Compared with 33 years of daily readings for this time of year. How to read levels
Key numbers
- Median for this date
- 1,790.09 ft1.53 ft below the median for this date
- Normal for this date
- 1,787.04 ft – 1,794.56 ft8 years in 10 fall in this range (33 years of records)
- Same day last year
- 1,787.19 ft+1.37 ft
- Lowest and highest in 30 days
- 1,788.56 ft – 1,790.83 ft
- Lowest and highest in 12 months
- 1,787.18 ft – 1,803.79 ft
On the water at Mann Lake and Reservoir A
A receding shoreline opens up beaches but also uncovers hazards: stumps, rocks and soft mud that are usually well under water.
Wear a life jacket on the water. Most boating deaths involve people who were not wearing one.
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 |
|---|---|---|---|---|
| Lapwai Creek near LapwaiRiver gauge, Lapwai Creek | 10.5 cfs | Normal | +0.3 cfs | 4.5 mi |
| Clearwater River at SpaldingRiver gauge, Clearwater River | 3.21 ft | Below flood stage | −0.05 ft | 5.5 mi |
| Asotin Creek at AsotinRiver gauge, Asotin Creek | 1.65 ft | Lowest on record | ±0 | 10 mi |
| Potlatch River Bel Little Potlatch Creek near SpaldingRiver gauge, Potlatch River Bel Little Potlatch Creek | 10.8 cfs | Very low | ±0 | 10 mi |
| Lake WahaLake | 3,366.61 ft | Normal | 11 mi | |
| Soldiers Meadow ReservoirReservoir | 4,496.11 ft | Low | 15 mi | |
| Snake River near AnatoneRiver gauge, Snake River | 3.31 ft | Low | +0.01 ft | 20 mi |
| Big Canyon Creek near PeckRiver gauge, Big Canyon Creek | 4.5 cfs | Low | +0.2 cfs | 22 mi |
Questions and answers
Is Mann Lake and Reservoir A higher than last year?
Yes, it is 1.37 ft higher than on the same day last year, when the reading was 1,787.19 ft.
What is a normal level for Mann Lake and Reservoir A in mid-October?
The median for mid-October is 1,790.09 ft. In 8 years out of 10 the reading falls between 1,787.04 ft and 1,794.56 ft, based on 33 years of records.
Is Mann Lake and Reservoir A really 1,788.56 ft deep?
No. 1,788.56 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 Mann Lake and Reservoir A today?
On Oct 18, 2026, the surface elevation was 1,788.56 ft. Down 0.63 ft over the last 7 days.
Is Mann Lake and Reservoir A rising or falling?
Down 0.63 ft over the last 7 days.
Is the level of Mann Lake and Reservoir A normal?
Low for mid-October. Compared with 33 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:7198(Agency page)- Coordinates
46.37111, -116.85750(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 | 1,788.56 ft | 2026-10-18 07:00 | Provisional |
| Water stored | 877 acre‑ft | 2026-10-18 07:00 | Provisional |
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How to cite
U.S. Bureau of Reclamation: Mann Lake and Reservoir A (usbr:7198). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/idaho/mann-lake-and-reservoir-a
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