Reservoir · Idaho · United States · BOR RISE
Mann Creek Reservoir and Dam
8.6% full
Capacity
15.46 hm³
Volume stored
1 hm³
Coordinates
44.392°N, 116.895°W
Last updated
2026-08-12
Current fill
8.6%vs 7 days ago
-5.5%losing
vs 1 year ago
-21.9%year-over-year
7-day trend
↓falling
Data source: BOR RISE — US Bureau of Reclamation — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-08-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.392, -116.895 · Open in Google Maps
About Mann Creek Reservoir and Dam
As of August 12, 2026, Mann Creek Reservoir and Dam is filled to 8.6% of its total capacity, holding roughly 1 hm³ of water out of a maximum 15 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has fallen by 5.5 percentage points, and it is 21.9 points below its level on the same date a year earlier.
Across the readings we hold for Mann Creek Reservoir and Dam — 2187 data points between August 15, 2021 and August 12, 2026 — the level has ranged from a low of 0.2% (October 4, 2024) to a high of 87.0% (April 23, 2024). On average the reservoir is fullest around May and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 44.392°N, 116.895°W.
Key facts
- Current fill level
- 8.6%
- Water stored
- 1 hm³
- Total capacity
- 15 hm³
- 7-day change
- ▼ 5.5 pts
- Year-on-year
- ▼ 21.9 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 44.392°N, 116.895°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 8.6% | 1 |
| 10 Aug 2026 | 10.0% | 2 |
| 8 Aug 2026 | 11.4% | 2 |
| 7 Aug 2026 | 12.2% | 2 |
| 6 Aug 2026 | 13.2% | 2 |
| 5 Aug 2026 | 14.1% | 2 |
| 4 Aug 2026 | 15.1% | 2 |
| 3 Aug 2026 | 16.2% | 3 |
| 2 Aug 2026 | 17.2% | 3 |
| 1 Aug 2026 | 18.2% | 3 |
| 31 Jul 2026 | 19.4% | 3 |
| 30 Jul 2026 | 20.5% | 3 |
Frequently asked questions
What is the current water level of Mann Creek Reservoir and Dam?
As of August 12, 2026, Mann Creek Reservoir and Dam is at 8.6% of its capacity, holding approximately 1 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Mann Creek Reservoir and Dam reservoir full?
No. As of August 12, 2026, Mann Creek Reservoir and Dam is critically low at 8.6% of its capacity, so it is not full.
Is the water level at Mann Creek Reservoir and Dam rising or falling?
The level at Mann Creek Reservoir and Dam is falling — it dropped 5.5 percentage points over the latest week on record.
How much water can Mann Creek Reservoir and Dam hold?
Mann Creek Reservoir and Dam has a total capacity of 15 hm³.
Where is Mann Creek Reservoir and Dam reservoir located?
Mann Creek Reservoir and Dam is located in Idaho, United States, within the Idaho basin (coordinates 44.392°N, 116.895°W).
What is Mann Creek Reservoir and Dam used for?
Mann Creek Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.