Monticello Reservoir: 75.2% full as of 2026-09-12
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 | 2026-09-12 | 75.2 | 335.27 | 26,113 | 26,113 | 34,740 | 1,584 |
| Yesterday | 2026-09-11 | 75.2 | 335.28 | 26,129 | 26,129 | 34,740 | 1,585 |
| 2 days ago | 2026-09-10 | 75.3 | 335.30 | 26,161 | 26,161 | 34,740 | 1,586 |
| 1 week ago | 2026-09-05 | 75.7 | 335.38 | 26,288 | 26,288 | 34,740 | 1,592 |
| 1 month ago | 2026-08-12 | 78.4 | 335.96 | 27,229 | 27,229 | 34,740 | 1,635 |
| 3 months ago | 2026-06-12 | 81.5 | 336.60 | 28,320 | 28,320 | 34,740 | 1,693 |
| 6 months ago | 2026-03-12 | 79.3 | 336.15 | 27,549 | 27,549 | 34,740 | 1,653 |
| 1 year ago | 2025-09-12 | 82.3 | 336.75 | 28,582 | 28,582 | 34,740 | 1,707 |
*
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 | 2026-09-12 22:15 | 335.26 | 340.00 | -4.74 |
| 1 hour prior | 2026-09-12 21:15 | 335.26 | 340.00 | -4.74 |
| 2 hours prior | 2026-09-12 20:15 | 335.26 | 340.00 | -4.74 |
| 6 hours prior | 2026-09-12 16:15 | 335.26 | 340.00 | -4.74 |
| 12 hours prior | 2026-09-12 10:15 | 335.25 | 340.00 | -4.75 |
| 24 hours prior | 2026-09-11 22:15 | 335.28 | 340.00 | -4.72 |
| 48 hours prior | 2026-09-10 22:15 | 335.28 | 340.00 | -4.72 |
*
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
