Reservoir · Washington · United States · USGS NWIS
Howard A. Hanson Reservoir
23.9% full
Capacity
92.76 hm³
Volume stored
22 hm³
Vs month average
159% of normal
Coordinates
47.277°N, 121.785°W
Last updated
2026-10-14
Current fill
23.9%vs 7 days ago
-4.9%losing
vs 1 year ago
+14.2%year-over-year
7-day trend
↓falling
Drought context
Storage vs October average
159%of normal
23.9% full on 2026-10-14, against an average of 15.0% for October across 5 years of readings (+8.9 points).
Drought Monitor at this site · 13 October 2026
D0abnormally dry
The ground at Howard A. Hanson Reservoir's coordinates falls inside the D0 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Washington drought figures →
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: 2026-10-14.
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 October 14, 2026, Howard A. Hanson Reservoir is filled to 23.9% of its total capacity, holding roughly 22 hm³ of water out of a maximum 93 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has fallen by 4.9 percentage points, and it is 14.2 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 October 15, 2022 and October 14, 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
- 23.9%
- Water stored
- 22 hm³
- Total capacity
- 93 hm³
- 7-day change
- ▼ 4.9 pts
- Year-on-year
- ▲ 14.2 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- USGS
- Coordinates
- 47.277°N, 121.785°W
- Last updated
- October 14, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 14 Oct 2026 | 23.9% | 22 |
| 13 Oct 2026 | 24.7% | 23 |
| 12 Oct 2026 | 25.4% | 24 |
| 11 Oct 2026 | 26.1% | 24 |
| 10 Oct 2026 | 26.7% | 25 |
| 9 Oct 2026 | 27.4% | 25 |
| 8 Oct 2026 | 28.1% | 26 |
| 7 Oct 2026 | 28.8% | 27 |
| 6 Oct 2026 | 29.6% | 27 |
| 5 Oct 2026 | 30.3% | 28 |
| 4 Oct 2026 | 30.9% | 29 |
| 3 Oct 2026 | 31.4% | 29 |