Reservoir · Colorado · United States · BOR RISE
Horsetooth Reservoir
Horsetooth Reservoir and Dam
74.5% full
Capacity
193.33 hm³
Volume stored
144 hm³
Vs month average
110% of normal
Coordinates
40.599°N, 105.171°W
Last updated
2026-10-27
Current fill
74.5%vs 7 days ago
-3.4 pplosing
vs 1 year ago
+12.2 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
110%of normal
74.5% full on 2026-10-27, against an average of 68.0% for October across 6 years of readings (+6.5 points).
Drought Monitor at this site · 20 October 2026
D3extreme drought
The ground at Horsetooth 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. Colorado 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: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.599°N, 105.171°W · Open in Google Maps
About Horsetooth Reservoir
As of October 27, 2026, Horsetooth Reservoir is filled to 74.5% of its total capacity, holding 143.96 hm³ of water out of a maximum 193.33 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 3.4 percentage points, and it is 12.2 points above its level on the same date a year earlier.
Across the readings we hold for Horsetooth Reservoir — 1951 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 49.5% (December 19, 2022) to a high of 99.6% (June 28, 2024). On average the reservoir is fullest around June and at its lowest around November.
It is operated by BOR primarily for multiple purposes. It is at 40.599°N, 105.171°W.
Key facts
- Current fill level
- 74.5% of total capacity
- Water stored
- 143.96 hm³
- Total capacity
- 193.33 hm³
- 7-day change
- ▼ 3.4 pp
- Year-on-year
- ▲ 12.2 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 40.599°N, 105.171°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 74.5% | 143.96 |
| 26 Oct 2026 | 75.0% | 145.01 |
| 25 Oct 2026 | 75.7% | 146.37 |
| 24 Oct 2026 | 76.1% | 147.18 |
| 23 Oct 2026 | 76.6% | 148.16 |
| 22 Oct 2026 | 77.1% | 149.01 |
| 21 Oct 2026 | 77.5% | 149.86 |
| 20 Oct 2026 | 77.9% | 150.59 |
| 19 Oct 2026 | 78.0% | 150.81 |
| 18 Oct 2026 | 78.1% | 151.03 |
| 17 Oct 2026 | 78.1% | 150.96 |
| 16 Oct 2026 | 78.0% | 150.74 |