Reservoir · Kansas · United States · BOR RISE
Kirwin Reservoir
Kirwin Reservoir and Dam
17.2% full
Capacity
122.73 hm³
Volume stored
21 hm³
Coordinates
39.664°N, 99.125°W
Last updated
2026-09-09
Current fill
17.2%vs 7 days ago
-0.2%losing
vs 1 year ago
-14.5%year-over-year
7-day trend
→stable
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. 39.664, -99.125 · Open in Google Maps
About Kirwin Reservoir
As of September 9, 2026, Kirwin Reservoir is filled to 17.2% of its total capacity, holding roughly 21 hm³ of water out of a maximum 123 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 14.5 points below its level on the same date a year earlier.
Across the readings we hold for Kirwin Reservoir — 2012 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 17.2% (September 9, 2026) to a high of 96.2% (June 13, 2022). On average the reservoir is fullest around June and at its lowest around August.
It is operated by BOR primarily for multiple purposes. It lies within the Kansas basin at 39.664°N, 99.125°W.
Key facts
- Current fill level
- 17.2%
- Water stored
- 21 hm³
- Total capacity
- 123 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▼ 14.5 pts
- Primary use
- Multipurpose
- River basin
- Kansas
- Operator
- BOR
- Coordinates
- 39.664°N, 99.125°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 17.2% | 21 |
| 8 Sep 2026 | 17.3% | 21 |
| 7 Sep 2026 | 17.3% | 21 |
| 6 Sep 2026 | 17.3% | 21 |
| 5 Sep 2026 | 17.3% | 21 |
| 4 Sep 2026 | 17.4% | 21 |
| 3 Sep 2026 | 17.4% | 21 |
| 2 Sep 2026 | 17.4% | 21 |
| 1 Sep 2026 | 17.5% | 21 |
| 31 Aug 2026 | 17.5% | 21 |
| 30 Aug 2026 | 17.7% | 22 |
| 29 Aug 2026 | 17.9% | 22 |