Reservoir · Washington · United States · USGS NWIS
Howard A. Hanson Reservoir
52.8% full
Capacity
92.76 hm³
Volume stored
49 hm³
Coordinates
47.277°N, 121.785°W
Last updated
2026-08-13
Current fill
52.8%vs 7 days ago
-2.2%losing
vs 1 year ago
+10.4%year-over-year
7-day trend
↓falling
Data source: USGS National Water Information System (NWIS) — daily reservoir storage volume. Design capacity is unavailable for this site, so fill % is estimated against the 5-year maximum storage and may overstate fullness. Last reading: 2026-08-13.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 47.277, -121.785 · Open in Google Maps
About Howard A. Hanson Reservoir
As of August 13, 2026, Howard A. Hanson Reservoir is filled to 52.8% of its total capacity, holding roughly 49 hm³ of water out of a maximum 93 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 2.2 percentage points, and it is 10.4 points above its level on the same date a year earlier.
Across the readings we hold for Howard A. Hanson Reservoir — 1447 data points between August 14, 2022 and August 13, 2026 — the level has ranged from a low of 0.1% (January 23, 2023) to a high of 100.0% (December 12, 2025). On average the reservoir is fullest around June and at its lowest around January.
It is operated by USGS primarily for multiple purposes. It lies within the Washington basin at 47.277°N, 121.785°W.
Key facts
- Current fill level
- 52.8%
- Water stored
- 49 hm³
- Total capacity
- 93 hm³
- 7-day change
- ▼ 2.2 pts
- Year-on-year
- ▲ 10.4 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- USGS
- Coordinates
- 47.277°N, 121.785°W
- Last updated
- August 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Aug 2026 | 52.8% | 49 |
| 12 Aug 2026 | 53.1% | 49 |
| 11 Aug 2026 | 53.4% | 50 |
| 10 Aug 2026 | 53.7% | 50 |
| 9 Aug 2026 | 54.0% | 50 |
| 8 Aug 2026 | 54.4% | 50 |
| 7 Aug 2026 | 54.7% | 51 |
| 6 Aug 2026 | 55.0% | 51 |
| 5 Aug 2026 | 55.2% | 51 |
| 4 Aug 2026 | 55.5% | 51 |
| 3 Aug 2026 | 55.7% | 52 |
| 2 Aug 2026 | 55.9% | 52 |
Frequently asked questions
What is the current water level of Howard A. Hanson Reservoir?
As of August 13, 2026, Howard A. Hanson Reservoir is at 52.8% of its capacity, holding approximately 49 hm³ of water, according to USGS NWIS data.
Is Howard A. Hanson Reservoir reservoir full?
No. As of August 13, 2026, Howard A. Hanson Reservoir is within its normal operating range at 52.8% of its capacity, so it is not full.
Is the water level at Howard A. Hanson Reservoir rising or falling?
The level at Howard A. Hanson Reservoir is falling — it dropped 2.2 percentage points over the latest week on record.
How much water can Howard A. Hanson Reservoir hold?
Howard A. Hanson Reservoir has a total capacity of 93 hm³.
Where is Howard A. Hanson Reservoir reservoir located?
Howard A. Hanson Reservoir is located in Washington, United States, within the Washington basin (coordinates 47.277°N, 121.785°W).
What is Howard A. Hanson Reservoir used for?
Howard A. Hanson Reservoir is used primarily for multiple purposes, and is managed by USGS.