Monticello Reservoir: 75.3% full as of 2026-09-10
Historical Data
| Date | Percent Full |
Mean Water Level (ft) |
Reservoir Storage (acre-ft) |
Conservation Storage (acre-ft) |
Conservation Capacity (acre-ft) |
Surface Area (acres) |
|
|---|---|---|---|---|---|---|---|
| Most recent | 2026-09-10 | 75.3 | 335.30 | 26,161 | 26,161 | 34,740 | 1,586 |
| 1 day prior | 2026-09-09 | 75.4 | 335.32 | 26,193 | 26,193 | 34,740 | 1,588 |
| 2 days prior | 2026-09-08 | 75.4 | 335.33 | 26,208 | 26,208 | 34,740 | 1,589 |
| 1 week prior | 2026-09-03 | 75.9 | 335.42 | 26,352 | 26,352 | 34,740 | 1,595 |
| 1 month prior | 2026-08-10 | 78.7 | 336.03 | 27,347 | 27,347 | 34,740 | 1,642 |
| 3 months prior | 2026-06-10 | 81.6 | 336.62 | 28,355 | 28,355 | 34,740 | 1,695 |
| 6 months prior | 2026-03-10 | 79.3 | 336.14 | 27,532 | 27,532 | 34,740 | 1,652 |
| 1 year prior | 2025-09-10 | 82.4 | 336.78 | 28,634 | 28,634 | 34,740 | 1,710 |
*
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 | 2026-09-10 23:15 | 335.29 | 340.00 | -4.71 |
| 1 hour prior | 2026-09-10 22:15 | 335.28 | 340.00 | -4.72 |
| 2 hours prior | 2026-09-10 21:15 | 335.30 | 340.00 | -4.70 |
| 6 hours prior | 2026-09-10 17:15 | 335.29 | 340.00 | -4.71 |
| 12 hours prior | 2026-09-10 11:15 | 335.30 | 340.00 | -4.70 |
| 24 hours prior | 2026-09-09 23:15 | 335.32 | 340.00 | -4.68 |
| 48 hours prior | 2026-09-08 23:15 | 335.35 | 340.00 | -4.65 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1973-01-01 |
| Vertical datum | NGVD29 |
| Service spillway crest elevation | 328.00 ft above NGVD29 |
| Emergency spillway crest elevation | 343.50 ft above NGVD29 |
| Top of dam elevation | 352.00 ft above NGVD29 |
| Conservation pool elevation | 340.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
Elevation-Area-Capacity Curves
1998-02-01 (source: TWDB)
: GIS Data
|
|
| Data Source | USGS:07344488 |
| USGS Monitoring Location | USGS:07344488 |
Lake Location
