Lake Sulphur Springs: 86.0% full as of 2026-09-21
Historical Data
| Date | Percent Full |
Mean Water Level (ft) |
Reservoir Storage (acre-ft) |
Conservation Storage (acre-ft) |
Conservation Capacity (acre-ft) |
Surface Area (acres) |
|
|---|---|---|---|---|---|---|---|
| Today | 2026-09-21 | 86.0 | 457.54 | 15,258 | 15,258 | 17,747 | - n.a. - |
| Yesterday | 2026-09-20 | 86.0 | 457.54 | 15,258 | 15,258 | 17,747 | - n.a. - |
| 2 days ago | 2026-09-19 | 86.3 | 457.57 | 15,308 | 15,308 | 17,747 | - n.a. - |
| 1 week ago | 2026-09-14 | 88.2 | 457.78 | 15,653 | 15,653 | 17,747 | - n.a. - |
| 1 month ago | 2026-08-21 | 93.2 | 458.29 | 16,544 | 16,544 | 17,747 | - n.a. - |
| 3 months ago | 2026-06-21 | 100.0 | 459.02 | 17,878 | 17,747 | 17,747 | - n.a. - |
| 6 months ago | 2026-03-21 | 80.5 | 456.94 | 14,281 | 14,281 | 17,747 | - n.a. - |
| 1 year ago | 2025-09-21 | 83.3 | 457.25 | 14,781 | 14,781 | 17,747 | - n.a. - |
*
Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.
**
Values above, including today's are averaged conditions. For near real-time instantaneous water level, see table below or the interactive map viewer.
Most Recent Instantaneous Water Level
| Date/time |
Water Level (ft) |
Conservation Pool Elevation (ft) |
Height Above Conservation Pool (ft) |
|
|---|---|---|---|---|
| Most recent | 2026-09-21 16:30 | 457.58 | 458.95 | -1.37 |
| 1 hour prior | 2026-09-21 15:30 | 457.58 | 458.95 | -1.37 |
| 2 hours prior | 2026-09-21 14:30 | 457.58 | 458.95 | -1.37 |
| 6 hours prior | 2026-09-21 10:30 | 457.58 | 458.95 | -1.37 |
| 12 hours prior | 2026-09-21 04:30 | 457.52 | 458.95 | -1.43 |
| 24 hours prior | 2026-09-20 16:30 | 457.54 | 458.95 | -1.41 |
| 48 hours prior | 2026-09-19 16:30 | 457.57 | 458.95 | -1.38 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1973-01-01 |
| Vertical datum | NGVD29 |
| Service spillway crest elevation | 441.00 ft above NGVD29 |
| Service spillway crest elevation | 457.00 ft above NGVD29 |
| Emergency spillway crest elevation | 462.00 ft above NGVD29 |
| Top of dam elevation | 474.00 ft above NGVD29 |
| Conservation pool elevation | 458.95 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
Elevation-Area-Capacity Curves
1973-01-01 (source: USGS)
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|
| Data Source | USGS:07343460 |
| USGS Monitoring Location | USGS:07343460 |
Lake Location
