Reservoir · Kansas · United States · BOR RISE
Kirwin Reservoir and Dam
26.4% full
Capacity
122.73 hm³
Volume stored
32 hm³
Coordinates
39.664°N, 99.125°W
Last updated
2026-07-28
Current fill
26.4%vs 7 days ago
-0.3%losing
vs 1 year ago
-6.6%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: 2026-07-28.
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 and Dam
As of July 28, 2026, Kirwin Reservoir and Dam is filled to 26.4% of its total capacity, holding roughly 32 hm³ of water out of a maximum 123 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.3 pts), and it is 6.6 points below its level on the same date a year earlier.
Across the readings we hold for Kirwin Reservoir and Dam — 1890 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 26.4% (July 28, 2026) to a high of 96.2% (June 13, 2022). On average the reservoir is fullest around August and at its lowest around October.
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
- 26.4%
- Water stored
- 32 hm³
- Total capacity
- 123 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▼ 6.6 pts
- Primary use
- Multipurpose
- River basin
- Kansas
- Operator
- BOR
- Coordinates
- 39.664°N, 99.125°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 26.4% | 32 |
| 27 Jul 2026 | 26.7% | 33 |
| 26 Jul 2026 | 27.3% | 33 |
| 25 Jul 2026 | 27.5% | 34 |
| 24 Jul 2026 | 27.5% | 34 |
| 23 Jul 2026 | 27.7% | 34 |
| 22 Jul 2026 | 27.9% | 34 |
| 21 Jul 2026 | 28.4% | 35 |
| 20 Jul 2026 | 28.8% | 35 |
| 19 Jul 2026 | 29.5% | 36 |
| 18 Jul 2026 | 29.9% | 37 |
| 17 Jul 2026 | 29.9% | 37 |
Frequently asked questions
What is the current water level of Kirwin Reservoir and Dam?
As of July 28, 2026, Kirwin Reservoir and Dam is at 26.4% of its capacity, holding approximately 32 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Kirwin Reservoir and Dam reservoir full?
No. As of July 28, 2026, Kirwin Reservoir and Dam is low at 26.4% of its capacity, so it is not full.
Is the water level at Kirwin Reservoir and Dam rising or falling?
The level at Kirwin Reservoir and Dam has been broadly stable over the latest week on record (-0.3 points).
How much water can Kirwin Reservoir and Dam hold?
Kirwin Reservoir and Dam has a total capacity of 123 hm³.
Where is Kirwin Reservoir and Dam reservoir located?
Kirwin Reservoir and Dam is located in Kansas, United States, within the Kansas basin (coordinates 39.664°N, 99.125°W).
What is Kirwin Reservoir and Dam used for?
Kirwin Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.