Reservoir · Colorado · United States · BOR RISE
Carter Lake Reservoir
Carter Lake Reservoir and Dam
67.3% full
Capacity
138.43 hm³
Volume stored
93 hm³
Coordinates
40.324°N, 105.212°W
Last updated
2026-09-09
Current fill
67.3%vs 7 days ago
-2.7%losing
vs 1 year ago
-3.0%year-over-year
7-day trend
↓falling
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. 40.324, -105.212 · Open in Google Maps
About Carter Lake Reservoir
As of September 9, 2026, Carter Lake Reservoir is filled to 67.3% of its total capacity, holding roughly 93 hm³ of water out of a maximum 138 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 2.7 percentage points, and it is 3.0 points below its level on the same date a year earlier.
Across the readings we hold for Carter Lake Reservoir — 1950 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 45.9% (December 27, 2022) to a high of 99.9% (July 10, 2023). On average the reservoir is fullest around May and at its lowest around November.
It is operated by BOR primarily for multiple purposes. It lies within the Colorado basin at 40.324°N, 105.212°W.
Key facts
- Current fill level
- 67.3%
- Water stored
- 93 hm³
- Total capacity
- 138 hm³
- 7-day change
- ▼ 2.7 pts
- Year-on-year
- ▼ 3.0 pts
- Primary use
- Multipurpose
- River basin
- Colorado
- Operator
- BOR
- Coordinates
- 40.324°N, 105.212°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 67.3% | 93 |
| 8 Sep 2026 | 67.7% | 94 |
| 7 Sep 2026 | 68.1% | 94 |
| 6 Sep 2026 | 68.4% | 95 |
| 5 Sep 2026 | 68.8% | 95 |
| 4 Sep 2026 | 69.2% | 96 |
| 3 Sep 2026 | 69.7% | 96 |
| 2 Sep 2026 | 70.0% | 97 |
| 1 Sep 2026 | 70.4% | 97 |
| 31 Aug 2026 | 70.7% | 98 |
| 30 Aug 2026 | 70.5% | 98 |
| 29 Aug 2026 | 70.3% | 97 |