Reservoir · Wyoming · United States · BOR RISE
Anchor Reservoir
Anchor Reservoir and Dam
5.1% full
Capacity
21.41 hm³
Volume stored
1 hm³
Coordinates
43.664°N, 108.824°W
Last updated
2026-09-09
Current fill
5.1%vs 7 days ago
-0.2%losing
vs 1 year ago
+2.1%year-over-year
7-day trend
→stable
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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.664, -108.824 · Open in Google Maps
About Anchor Reservoir
As of September 9, 2026, Anchor Reservoir is filled to 5.1% of its total capacity, holding roughly 1 hm³ of water out of a maximum 21 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 2.1 points above its level on the same date a year earlier.
Across the readings we hold for Anchor Reservoir — 1915 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 2.5% (January 14, 2022) to a high of 57.0% (January 17, 2025). On average the reservoir is fullest around June and at its lowest around February.
It is operated by BOR primarily for multiple purposes. It lies within the Wyoming basin at 43.664°N, 108.824°W.
Key facts
- Current fill level
- 5.1%
- Water stored
- 1 hm³
- Total capacity
- 21 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▲ 2.1 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 43.664°N, 108.824°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 5.1% | 1 |
| 8 Sep 2026 | 5.1% | 1 |
| 7 Sep 2026 | 5.1% | 1 |
| 6 Sep 2026 | 5.1% | 1 |
| 5 Sep 2026 | 5.2% | 1 |
| 4 Sep 2026 | 5.2% | 1 |
| 3 Sep 2026 | 5.2% | 1 |
| 2 Sep 2026 | 5.3% | 1 |
| 1 Sep 2026 | 5.2% | 1 |
| 31 Aug 2026 | 5.2% | 1 |
| 30 Aug 2026 | 5.2% | 1 |
| 29 Aug 2026 | 5.1% | 1 |