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Mann Lake and Reservoir A water level

Reservoir, Idaho, United States

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Right now

Normal for mid-October

Surface elevation

1,788.56ft Down 0.63 ft over the last 7 days

Water stored
877 acre‑ft
1,788 1,790 1,793 1,795

History

History
1,7881,7901,7931,795ftOct 14Oct 15Oct 16Oct 17Oct 181,7881,7901,7931,795ftOct 14Oct 16Oct 18
1,7881,7901,7931,795ftSep 21Sep 27Oct 4Oct 11Oct 181,7881,7901,7931,795ftSep 21Oct 4Oct 18
1,7901,800ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20261,7901,800ftOct 2025Apr 2026Oct 2026
1,7901,800ftOct 2016Apr 2019Oct 2021Apr 2024Oct 20261,7901,800ftOct 2016Oct 2021Oct 2026
1,7901,800ftJanMarMayJulSepNov20261,7901,800ftJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

Mann Lake and Reservoir A is at 1,788.56 ft, in the normal range for mid-October.

The median for mid-October is 1,790.08 ft, based on 33 years of readings, so the lake level is 1.52 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. 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
1,790.08 ft1.52 ft below the median for this date
Normal for this date
1,787.00 ft – 1,794.49 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

Normal levels mean few surprises on the water: ramps in use and the shoreline where you expect it.

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.

19 Mon 65° 44° – Wind 8 mph
20 Tue 70° 46° – Wind 7 mph
21 Wed 72° 49° 0.04 in Wind 5 mph
22 Thu 65° 52° 0.02 in, 68% Wind 6 mph
23 Fri 57° 45° 0.51 in, 45% Wind 15 mph
24 Sat 58° 40° – Wind 5 mph
25 Sun 63° 43° – Wind 4 mph

Forecast: Open-Meteo

Sunrise 07:12 AM Sunset 05:53 PM Daylight 10 hr, 41 min First quarter 66%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Lapwai Creek near LapwaiRiver gauge, Lapwai Creek 10.5 cfs Normal ±0 4.5 mi
Clearwater River at SpaldingRiver gauge, Clearwater River 3.22 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 3.30 ft Low ±0 20 mi
Big Canyon Creek near PeckRiver gauge, Big Canyon Creek 4.5 cfs Low ±0 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 1,790.08 ft. In 8 years out of 10 the reading falls between 1,787.00 ft and 1,794.49 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?

Normal 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

ParameterLast valueTime (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 20, 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.