Reservoir · Nebraska · United States · USACE CWMS
Harlan County Dam & Reservoir
49.4% full
Capacity
404.09 hm³
Volume stored
200 hm³
Coordinates
40.070°N, 99.212°W
Last updated
2026-09-11
Current fill
49.4%vs 7 days ago
-0.6%losing
vs 1 year ago
N/A7-day trend
→stable
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: 2026-09-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.070, -99.212 · Open in Google Maps
About Harlan County Dam & Reservoir
As of September 11, 2026, Harlan County Dam & Reservoir is filled to 49.4% of its total capacity, holding roughly 200 hm³ of water out of a maximum 404 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.6 pts).
Across the readings we hold for Harlan County Dam & Reservoir — 328 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 49.4% (September 11, 2026) to a high of 91.2% (April 6, 2022). On average the reservoir is fullest around April and at its lowest around August.
It is operated by USACE primarily for multiple purposes. It lies within the Nebraska basin at 40.070°N, 99.212°W.
Key facts
- Current fill level
- 49.4%
- Water stored
- 200 hm³
- Total capacity
- 404 hm³
- 7-day change
- ▼ 0.6 pts
- Primary use
- Multipurpose
- River basin
- Nebraska
- Operator
- USACE
- Coordinates
- 40.070°N, 99.212°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 49.4% | 200 |
| 10 Sep 2026 | 49.5% | 200 |
| 9 Sep 2026 | 49.5% | 200 |
| 8 Sep 2026 | 49.6% | 200 |
| 7 Sep 2026 | 49.8% | 201 |
| 6 Sep 2026 | 49.9% | 202 |
| 5 Sep 2026 | 49.9% | 201 |
| 4 Sep 2026 | 50.0% | 202 |
| 3 Sep 2026 | 50.1% | 202 |
| 2 Sep 2026 | 50.3% | 203 |
| 1 Sep 2026 | 50.5% | 204 |
| 31 Aug 2026 | 50.7% | 205 |