Reservoir · Washington · United States · USGS NWIS
Mud Mountain Lake
0.0% full
Capacity
130.75 hm³
Volume stored
0 hm³
Coordinates
47.141°N, 121.931°W
Last updated
2026-09-30
Current fill
0.0%vs 7 days ago
0.0%stable
vs 1 year ago
0.0%year-over-year
7-day trend
→stable
Data source: USGS National Water Information System (NWIS) — 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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 47.141, -121.931 · Open in Google Maps
About Mud Mountain Lake
As of September 30, 2026, Mud Mountain Lake is filled to 0.0% of its total capacity, holding roughly 0 hm³ of water out of a maximum 131 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Mud Mountain Lake — 1451 data points between October 1, 2022 and September 30, 2026 — the level has ranged from a low of 0.0% (October 1, 2022) to a high of 69.6% (December 13, 2025). On average the reservoir is fullest around December and at its lowest around July.
It is operated by USGS primarily for multiple purposes. It lies within the Washington basin at 47.141°N, 121.931°W.
Key facts
- Current fill level
- 0.0%
- Water stored
- 0 hm³
- Total capacity
- 131 hm³
- 7-day change
- No change
- Year-on-year
- No change
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- USGS
- Coordinates
- 47.141°N, 121.931°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 0.0% | 0 |
| 29 Sep 2026 | 0.0% | 0 |
| 28 Sep 2026 | 0.0% | 0 |
| 27 Sep 2026 | 0.0% | 0 |
| 26 Sep 2026 | 0.0% | 0 |
| 25 Sep 2026 | 0.0% | 0 |
| 24 Sep 2026 | 0.0% | 0 |
| 23 Sep 2026 | 0.0% | 0 |
| 22 Sep 2026 | 0.0% | 0 |
| 21 Sep 2026 | 0.0% | 0 |
| 20 Sep 2026 | 0.0% | 0 |
| 19 Sep 2026 | 0.0% | 0 |