Reservoir · Wyoming · United States · USACE CWMS
Anchor Reservoir
5.1% full
Capacity
21.41 hm³
Volume stored
1 hm³
Vs month average
121% of normal
Coordinates
43.664°N, 108.824°W
Last updated
2026-10-15
Current fill
5.1%vs 7 days ago
+0.3%gaining
vs 1 year ago
+2.1%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
121%of normal
5.1% full on 2026-10-15, against an average of 4.2% for October across 6 years of readings (+0.9 points).
Drought Monitor at this site · 13 October 2026
D3extreme drought
The ground at Anchor Reservoir's coordinates falls inside the D3 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Wyoming drought figures →
Data source: USACE CWMS — US Army Corps of Engineers — 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: 2026-10-15.
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 October 15, 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 (+0.3 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 — 1789 data points between October 16, 2021 and October 15, 2026 — the level has ranged from a low of 2.5% (January 15, 2022) to a high of 76.1% (May 20, 2022). On average the reservoir is fullest around June and at its lowest around February.
It is operated by USACE 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
- ▲ 0.3 pts
- Year-on-year
- ▲ 2.1 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- USACE
- Coordinates
- 43.664°N, 108.824°W
- Last updated
- October 15, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 15 Oct 2026 | 5.1% | 1 |
| 14 Oct 2026 | 5.1% | 1 |
| 13 Oct 2026 | 5.0% | 1 |
| 12 Oct 2026 | 4.8% | 1 |
| 11 Oct 2026 | 4.7% | 1 |
| 10 Oct 2026 | 4.7% | 1 |
| 9 Oct 2026 | 4.8% | 1 |
| 8 Oct 2026 | 4.8% | 1 |
| 7 Oct 2026 | 4.9% | 1 |
| 6 Oct 2026 | 4.9% | 1 |
| 5 Oct 2026 | 5.0% | 1 |
| 4 Oct 2026 | 5.0% | 1 |