Reservoir · Wyoming · United States · BOR RISE
Bull Lake Reservoir
Bull Lake Reservoir and Dam
49.2% full
Capacity
188.06 hm³
Volume stored
92 hm³
Vs month average
134% of normal
Coordinates
43.210°N, 109.042°W
Last updated
2026-10-28
Current fill
49.2%vs 7 days ago
+1.5 ppgaining
vs 1 year ago
+26.5 ppyear-over-year
7-day trend
↑rising
Drought context
Storage vs October average
134%of normal
49.2% full on 2026-10-28, against an average of 36.7% for October across 6 years of readings (+12.5 points).
Drought Monitor at this site · 27 October 2026
D2severe drought
The ground at Bull Lake Reservoir's coordinates falls inside the D2 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. 43.210°N, 109.042°W · Open in Google Maps
About Bull Lake Reservoir
As of October 28, 2026, Bull Lake Reservoir is filled to 49.2% of its total capacity, holding 92.46 hm³ of water out of a maximum 188.06 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has risen by 1.5 percentage points, and it is 26.5 points above its level on the same date a year earlier.
Across the readings we hold for Bull Lake Reservoir — 1951 data points between October 30, 2021 and October 28, 2026 — the level has ranged from a low of 17.8% (September 2, 2025) to a high of 98.9% (July 17, 2022). On average the reservoir is fullest around July and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It is at 43.210°N, 109.042°W.
Key facts
- Current fill level
- 49.2% of total capacity
- Water stored
- 92.46 hm³
- Total capacity
- 188.06 hm³
- 7-day change
- ▲ 1.5 pp
- Year-on-year
- ▲ 26.5 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 43.210°N, 109.042°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 49.2% | 92.46 |
| 27 Oct 2026 | 49.0% | 92.13 |
| 26 Oct 2026 | 48.8% | 91.74 |
| 25 Oct 2026 | 48.4% | 91.08 |
| 24 Oct 2026 | 48.3% | 90.84 |
| 23 Oct 2026 | 48.1% | 90.48 |
| 22 Oct 2026 | 47.9% | 90.12 |
| 21 Oct 2026 | 47.7% | 89.7 |
| 20 Oct 2026 | 47.5% | 89.25 |
| 19 Oct 2026 | 47.2% | 88.78 |
| 18 Oct 2026 | 46.9% | 88.24 |
| 17 Oct 2026 | 46.6% | 87.65 |