Reservoir · Kansas · United States · BOR RISE
Kirwin Reservoir
Kirwin Reservoir and Dam
17.6% full
Capacity
122.73 hm³
Volume stored
22 hm³
Vs month average
40% of normal
Coordinates
39.664°N, 99.125°W
Last updated
2026-10-27
Current fill
17.6%vs 7 days ago
0.0 ppstable
vs 1 year ago
-13.8 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
40%of normal
17.6% full on 2026-10-27, against an average of 44.2% for October across 6 years of readings (-26.6 points).
Drought Monitor at this site · 20 October 2026
Nonenot in a drought category
Kirwin Reservoir's coordinates fall outside every category on the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Kansas 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. 39.664°N, 99.125°W · Open in Google Maps
About Kirwin Reservoir
As of October 27, 2026, Kirwin Reservoir is filled to 17.6% of its total capacity, holding 21.63 hm³ of water out of a maximum 122.73 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (+0.0 pp), and it is 13.8 points below its level on the same date a year earlier.
Across the readings we hold for Kirwin Reservoir — 2013 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 17.0% (September 15, 2026) to a high of 96.2% (June 13, 2022). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It is at 39.664°N, 99.125°W.
Key facts
- Current fill level
- 17.6% of total capacity
- Water stored
- 21.63 hm³
- Total capacity
- 122.73 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 13.8 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 39.664°N, 99.125°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 17.6% | 21.63 |
| 26 Oct 2026 | 17.6% | 21.65 |
| 25 Oct 2026 | 17.2% | 21.07 |
| 24 Oct 2026 | 17.2% | 21.07 |
| 23 Oct 2026 | 17.6% | 21.57 |
| 22 Oct 2026 | 17.6% | 21.57 |
| 21 Oct 2026 | 17.6% | 21.57 |
| 20 Oct 2026 | 17.6% | 21.56 |
| 19 Oct 2026 | 17.6% | 21.56 |
| 18 Oct 2026 | 17.2% | 21.09 |
| 17 Oct 2026 | 17.2% | 21.09 |
| 16 Oct 2026 | 17.6% | 21.57 |