Howard A Hanson Reservoir water level
▲ 39 points from 55.8% a year ago
Source: waterdata.usgs.gov/monitoring-location/USGS-12105800, accessed October 1, 2026. Updated every 6 hours.
Howard A Hanson Reservoir is at 95.8% of full pool as of September 29, 2026. Howard A Hanson Reservoir was last full on September 29, 2026 (96.3% of normal storage). Howard A Hanson Reservoir is near Palmer, Washington.
Howard A Hanson Reservoir level history
This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Highs and lows are daily readings in the published data, not official records. Source: USGS daily data.
Storage, % of full pool, since 2007
Howard A Hanson Reservoir is falling: 97.2% full, down 6.4 percentage points since September 27, 2026.
On this same date last year (September 28, 2025), Howard A Hanson Reservoir was 55.8% full, 41.4 percentage points lower than today's 97.2%.
Weekly averages of the source's daily readings; older years may be monthly or sparser where that is all the source published. Download the charted data (JSON).
Howard A Hanson Reservoir map
Howard A Hanson Reservoir is at 47.2770, -121.7854. Open in OpenStreetMap.
The dam
- Flood control
- Water supply
Sources: nid.sec.usace.army.mil, accessed September 29, 2026
On the water
No campgrounds, boat ramps, or swim spots linked to Howard A Hanson Reservoir yet.
Common questions
- Howard A Hanson Reservoir is at 95.8% of full pool as of September 29, 2026.
- Howard A Hanson Reservoir was last full on September 29, 2026, when it held 96.3% of its normal storage. This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Based on USGS daily data since October 1, 2007.
- In USGS daily data since October 1, 2007, Howard A Hanson Reservoir's highest storage was 149.9% of normal storage on July 24, 2008. Its lowest after it first filled (May 12, 2008) was 0.2% of normal storage on January 23, 2023. These are the highest and lowest daily readings in the published data, not official records.
- Howard A Hanson Reservoir is near Palmer, Washington (47.2770, -121.7854).
- US Army Corps of Engineers operates the dam at Howard A Hanson Reservoir.
- Howard A Hanson Reservoir's dam is used for Flood control, Water supply.