Reservoir · Illinois · United States · USACE CWMS
Sub
105.0% full
Capacity
4.3 hm³
Volume stored
5 hm³
Coordinates
38.176°N, 89.006°W
Last updated
2026-09-14
Current fill
105.0%vs 7 days ago
+0.1%gaining
vs 1 year ago
N/A7-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: 2026-09-14.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 38.176, -89.006 · Open in Google Maps
About Sub
As of September 14, 2026, Sub is filled to 105.0% of its total capacity, holding roughly 5 hm³ of water out of a maximum 4 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (+0.1 pts).
Across the readings we hold for Sub — 93 data points between June 14, 2026 and September 14, 2026 — the level has ranged from a low of 76.7% (July 28, 2026) to a high of 105.0% (August 18, 2026).
It is operated by USACE primarily for multiple purposes. It lies within the Illinois basin at 38.176°N, 89.006°W.
Key facts
- Current fill level
- 105.0%
- Water stored
- 5 hm³
- Total capacity
- 4 hm³
- 7-day change
- ▲ 0.1 pts
- Primary use
- Multipurpose
- River basin
- Illinois
- Operator
- USACE
- Coordinates
- 38.176°N, 89.006°W
- Last updated
- September 14, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 14 Sep 2026 | 105.0% | 5 |
| 13 Sep 2026 | 105.0% | 5 |
| 12 Sep 2026 | 105.0% | 5 |
| 11 Sep 2026 | 105.0% | 5 |
| 10 Sep 2026 | 105.0% | 5 |
| 9 Sep 2026 | 103.7% | 4 |
| 8 Sep 2026 | 104.4% | 4 |
| 7 Sep 2026 | 104.9% | 5 |
| 6 Sep 2026 | 105.0% | 5 |
| 5 Sep 2026 | 105.0% | 5 |
| 4 Sep 2026 | 105.0% | 5 |
| 3 Sep 2026 | 105.0% | 5 |