Reservoir · Washington · United States · USGS NWIS
Lake Tapps
90.0% full
Capacity
57.6 hm³
Volume stored
52 hm³
Coordinates
47.241°N, 122.192°W
Last updated
2026-08-12
Current fill
90.0%vs 7 days ago
+0.3%gaining
vs 1 year ago
-8.8%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: 2026-08-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 47.241, -122.192 · Open in Google Maps
About Lake Tapps
As of August 12, 2026, Lake Tapps is filled to 90.0% of its total capacity, holding roughly 52 hm³ of water out of a maximum 58 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.3 pts), and it is 8.8 points below its level on the same date a year earlier.
Across the readings we hold for Lake Tapps — 1458 data points between August 14, 2022 and August 12, 2026 — the level has ranged from a low of 73.6% (January 6, 2023) to a high of 99.9% (May 12, 2023). On average the reservoir is fullest around May and at its lowest around January.
It is operated by USGS primarily for multiple purposes. It lies within the Washington basin at 47.241°N, 122.192°W.
Key facts
- Current fill level
- 90.0%
- Water stored
- 52 hm³
- Total capacity
- 58 hm³
- 7-day change
- ▲ 0.3 pts
- Year-on-year
- ▼ 8.8 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- USGS
- Coordinates
- 47.241°N, 122.192°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 90.0% | 52 |
| 11 Aug 2026 | 89.8% | 52 |
| 10 Aug 2026 | 89.7% | 52 |
| 9 Aug 2026 | 89.6% | 52 |
| 8 Aug 2026 | 89.7% | 52 |
| 7 Aug 2026 | 89.6% | 52 |
| 6 Aug 2026 | 89.5% | 52 |
| 5 Aug 2026 | 89.7% | 52 |
| 4 Aug 2026 | 89.9% | 52 |
| 3 Aug 2026 | 90.1% | 52 |
| 2 Aug 2026 | 90.3% | 52 |
| 1 Aug 2026 | 90.5% | 52 |
Frequently asked questions
What is the current water level of Lake Tapps?
As of August 12, 2026, Lake Tapps is at 90.0% of its capacity, holding approximately 52 hm³ of water, according to USGS NWIS data.
Is Lake Tapps reservoir full?
No. As of August 12, 2026, Lake Tapps is high at 90.0% of its capacity, so it is not full.
Is the water level at Lake Tapps rising or falling?
The level at Lake Tapps has been broadly stable over the latest week on record (+0.3 points).
How much water can Lake Tapps hold?
Lake Tapps has a total capacity of 58 hm³.
Where is Lake Tapps reservoir located?
Lake Tapps is located in Washington, United States, within the Washington basin (coordinates 47.241°N, 122.192°W).
What is Lake Tapps used for?
Lake Tapps is used primarily for multiple purposes, and is managed by USGS.