Lake Tapps water level
▼ 6.1 points from 92.7% a year ago
Source: waterdata.usgs.gov/monitoring-location/USGS-12101000, accessed October 1, 2026. Updated every 6 hours.
Lake Tapps is at 86.8% of full pool as of September 29, 2026. Lake Tapps was last full on July 6, 2026 (95% of normal storage). Lake Tapps is near Sumner, Washington.
Lake Tapps 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 2004
Lake Tapps is falling: 86.9% full, down 0.6 percentage points since September 27, 2026.
On this same date last year (September 28, 2025), Lake Tapps was 92.7% full, 5.8 percentage points higher than today's 86.9%.
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).
Lake Tapps map
Lake Tapps is at 47.2409, -122.1918. Open in OpenStreetMap.
The dam
- Recreation
Sources: nid.sec.usace.army.mil, accessed September 29, 2026
On the water
No campgrounds, boat ramps, or swim spots linked to Lake Tapps yet.
Common questions
- Lake Tapps is at 86.8% of full pool as of September 29, 2026.
- Lake Tapps was last full on July 6, 2026, when it held 95% 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, 2004.
- In USGS daily data since October 1, 2004, Lake Tapps's highest storage was 100.1% of normal storage on May 6, 2022. Its lowest after it first filled (October 1, 2004) was 0% of normal storage on October 29, 2014. These are the highest and lowest daily readings in the published data, not official records.
- Lake Tapps is near Sumner, Washington (47.2409, -122.1918).
- Utility operates the dam at Lake Tapps.
- Lake Tapps's dam is used for Recreation.