Reservoir · Kansas · United States · USACE CWMS
Marion Lake
98.4% full
Capacity
99.52 hm³
Volume stored
98 hm³
Coordinates
38.372°N, 97.082°W
Last updated
2026-07-30
Current fill
98.4%vs 7 days ago
-0.2%losing
vs 1 year ago
+2.5%year-over-year
7-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: 2026-07-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 38.372, -97.082 · Open in Google Maps
About Marion Lake
As of July 30, 2026, Marion Lake is filled to 98.4% of its total capacity, holding roughly 98 hm³ of water out of a maximum 100 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 2.5 points above its level on the same date a year earlier.
Across the readings we hold for Marion Lake — 330 data points between July 31, 2021 and July 30, 2026 — the level has ranged from a low of 85.6% (February 15, 2022) to a high of 101.5% (June 27, 2026). On average the reservoir is fullest around July and at its lowest around February.
It is operated by USACE primarily for multiple purposes. It lies within the Kansas basin at 38.372°N, 97.082°W.
Key facts
- Current fill level
- 98.4%
- Water stored
- 98 hm³
- Total capacity
- 100 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▲ 2.5 pts
- Primary use
- Multipurpose
- River basin
- Kansas
- Operator
- USACE
- Coordinates
- 38.372°N, 97.082°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 98.4% | 98 |
| 29 Jul 2026 | 98.6% | 98 |
| 28 Jul 2026 | 98.7% | 98 |
| 27 Jul 2026 | 98.7% | 98 |
| 26 Jul 2026 | 99.0% | 99 |
| 25 Jul 2026 | 99.2% | 99 |
| 24 Jul 2026 | 99.2% | 99 |
| 23 Jul 2026 | 99.0% | 99 |
| 22 Jul 2026 | 98.4% | 98 |
| 21 Jul 2026 | 98.8% | 98 |
| 20 Jul 2026 | 99.0% | 99 |
| 19 Jul 2026 | 99.2% | 99 |
Frequently asked questions
What is the current water level of Marion Lake?
As of July 30, 2026, Marion Lake is at 98.4% of its capacity, holding approximately 98 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Marion Lake reservoir full?
Marion Lake is essentially full, sitting at 98.4% of capacity as of July 30, 2026.
Is the water level at Marion Lake rising or falling?
The level at Marion Lake has been broadly stable over the latest week on record (-0.2 points).
How much water can Marion Lake hold?
Marion Lake has a total capacity of 100 hm³.
Where is Marion Lake reservoir located?
Marion Lake is located in Kansas, United States, within the Kansas basin (coordinates 38.372°N, 97.082°W).
What is Marion Lake used for?
Marion Lake is used primarily for multiple purposes, and is managed by USACE.