Reservoir · Wyoming · United States · BOR RISE
Anchor Reservoir
Anchor Reservoir and Dam
5.0% full
Capacity
21.41 hm³
Volume stored
1 hm³
Vs month average
116% of normal
Coordinates
43.664°N, 108.824°W
Last updated
2026-10-28
Current fill
5.0%vs 7 days ago
-0.1 pplosing
vs 1 year ago
+2.1 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
116%of normal
5.0% full on 2026-10-28, against an average of 4.3% for October across 6 years of readings (+0.7 points).
Drought Monitor at this site · 27 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: 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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.664°N, 108.824°W · Open in Google Maps
About Anchor Reservoir
As of October 28, 2026, Anchor Reservoir is filled to 5.0% of its total capacity, holding 1.07 hm³ of water out of a maximum 21.41 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.1 pp), and it is 2.1 points above its level on the same date a year earlier.
Across the readings we hold for Anchor Reservoir — 1916 data points between October 30, 2021 and October 28, 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 is at 43.664°N, 108.824°W.
Key facts
- Current fill level
- 5.0% of total capacity
- Water stored
- 1.07 hm³
- Total capacity
- 21.41 hm³
- 7-day change
- ▼ 0.1 pp
- Year-on-year
- ▲ 2.1 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 43.664°N, 108.824°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 5.0% | 1.07 |
| 27 Oct 2026 | 5.0% | 1.08 |
| 26 Oct 2026 | 5.0% | 1.08 |
| 25 Oct 2026 | 5.1% | 1.09 |
| 24 Oct 2026 | 5.1% | 1.09 |
| 23 Oct 2026 | 5.0% | 1.08 |
| 22 Oct 2026 | 5.0% | 1.08 |
| 21 Oct 2026 | 5.1% | 1.09 |
| 20 Oct 2026 | 5.1% | 1.09 |
| 19 Oct 2026 | 5.1% | 1.09 |
| 18 Oct 2026 | 5.1% | 1.09 |
| 17 Oct 2026 | 5.1% | 1.09 |