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
36% of normal
Coordinates
39.664°N, 99.125°W
Last updated
2026-10-12
Current fill
17.6%vs 7 days ago
0.0%stable
vs 1 year ago
-14.2%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
36%of normal
17.6% full on 2026-10-12, against an average of 49.0% for October across 6 years of readings (-31.4 points).
Drought Monitor at this site · 6 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: 2026-10-12.
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 October 12, 2026, Kirwin Reservoir is filled to 17.6% of its total capacity, holding roughly 22 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 (+0.0 pts), and it is 14.2 points below its level on the same date a year earlier.
Across the readings we hold for Kirwin Reservoir — 2013 data points between October 14, 2021 and October 12, 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 September.
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
- 17.6%
- Water stored
- 22 hm³
- Total capacity
- 123 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 14.2 pts
- Primary use
- Multipurpose
- River basin
- Kansas
- Operator
- BOR
- Coordinates
- 39.664°N, 99.125°W
- Last updated
- October 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Oct 2026 | 17.6% | 22 |
| 11 Oct 2026 | 17.6% | 22 |
| 10 Oct 2026 | 17.6% | 22 |
| 9 Oct 2026 | 17.6% | 22 |
| 8 Oct 2026 | 17.6% | 22 |
| 7 Oct 2026 | 17.6% | 22 |
| 6 Oct 2026 | 17.6% | 22 |
| 5 Oct 2026 | 17.6% | 22 |
| 4 Oct 2026 | 17.2% | 21 |
| 3 Oct 2026 | 17.2% | 21 |
| 2 Oct 2026 | 17.6% | 22 |
| 1 Oct 2026 | 17.6% | 22 |