Reservoir · Washington · United States · BOR RISE
Rimrock Lake and Tieton Dam
86.3% full
Capacity
244.23 hm³
Volume stored
211 hm³
Coordinates
46.657°N, 121.129°W
Last updated
2026-08-11
Current fill
86.3%vs 7 days ago
-2.0%losing
vs 1 year ago
+13.6%year-over-year
7-day trend
↓falling
Data source: BOR RISE — US Bureau of Reclamation — 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: 2026-08-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 46.657, -121.129 · Open in Google Maps
About Rimrock Lake and Tieton Dam
As of August 11, 2026, Rimrock Lake and Tieton Dam is filled to 86.3% of its total capacity, holding roughly 211 hm³ of water out of a maximum 244 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 2.0 percentage points, and it is 13.6 points above its level on the same date a year earlier.
Across the readings we hold for Rimrock Lake and Tieton Dam — 2183 data points between August 15, 2021 and August 11, 2026 — the level has ranged from a low of 5.8% (October 13, 2024) to a high of 100.0% (June 30, 2022). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Washington basin at 46.657°N, 121.129°W.
Key facts
- Current fill level
- 86.3%
- Water stored
- 211 hm³
- Total capacity
- 244 hm³
- 7-day change
- ▼ 2.0 pts
- Year-on-year
- ▲ 13.6 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- BOR
- Coordinates
- 46.657°N, 121.129°W
- Last updated
- August 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Aug 2026 | 86.3% | 211 |
| 9 Aug 2026 | 86.9% | 212 |
| 8 Aug 2026 | 87.2% | 213 |
| 7 Aug 2026 | 87.5% | 214 |
| 5 Aug 2026 | 88.0% | 215 |
| 4 Aug 2026 | 88.3% | 216 |
| 3 Aug 2026 | 88.6% | 216 |
| 2 Aug 2026 | 88.9% | 217 |
| 1 Aug 2026 | 89.2% | 218 |
| 31 Jul 2026 | 89.5% | 218 |
| 30 Jul 2026 | 89.7% | 219 |
| 29 Jul 2026 | 90.0% | 220 |
Frequently asked questions
What is the current water level of Rimrock Lake and Tieton Dam?
As of August 11, 2026, Rimrock Lake and Tieton Dam is at 86.3% of its capacity, holding approximately 211 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Rimrock Lake and Tieton Dam reservoir full?
No. As of August 11, 2026, Rimrock Lake and Tieton Dam is high at 86.3% of its capacity, so it is not full.
Is the water level at Rimrock Lake and Tieton Dam rising or falling?
The level at Rimrock Lake and Tieton Dam is falling — it dropped 2.0 percentage points over the latest week on record.
How much water can Rimrock Lake and Tieton Dam hold?
Rimrock Lake and Tieton Dam has a total capacity of 244 hm³.
Where is Rimrock Lake and Tieton Dam reservoir located?
Rimrock Lake and Tieton Dam is located in Washington, United States, within the Washington basin (coordinates 46.657°N, 121.129°W).
What is Rimrock Lake and Tieton Dam used for?
Rimrock Lake and Tieton Dam is used primarily for multiple purposes, and is managed by BOR.