Monticello Reservoir: 74.2% 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) |
|
|---|---|---|---|---|---|---|---|
| Most recent | 2026-09-21 | 74.2 | 335.05 | 25,766 | 25,766 | 34,740 | 1,569 |
| 1 day prior | 2026-09-20 | 74.3 | 335.07 | 25,798 | 25,798 | 34,740 | 1,571 |
| 2 days prior | 2026-09-19 | 74.4 | 335.10 | 25,845 | 25,845 | 34,740 | 1,573 |
| 1 week prior | 2026-09-14 | 74.9 | 335.22 | 26,034 | 26,034 | 34,740 | 1,581 |
| 1 month prior | 2026-08-21 | 77.2 | 335.72 | 26,833 | 26,833 | 34,740 | 1,617 |
| 3 months prior | 2026-06-21 | 81.9 | 336.67 | 28,442 | 28,442 | 34,740 | 1,700 |
| 6 months prior | 2026-03-21 | 78.8 | 336.05 | 27,381 | 27,381 | 34,740 | 1,644 |
| 1 year prior | 2025-09-21 | 81.6 | 336.62 | 28,355 | 28,355 | 34,740 | 1,695 |
*
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 23:15 | 335.04 | 340.00 | -4.96 |
| 1 hour prior | 2026-09-21 22:15 | 335.03 | 340.00 | -4.97 |
| 2 hours prior | 2026-09-21 21:15 | 335.05 | 340.00 | -4.95 |
| 6 hours prior | 2026-09-21 17:15 | 335.05 | 340.00 | -4.95 |
| 12 hours prior | 2026-09-21 11:15 | 335.05 | 340.00 | -4.95 |
| 24 hours prior | 2026-09-20 23:15 | 335.06 | 340.00 | -4.94 |
| 48 hours prior | 2026-09-19 23:15 | 335.10 | 340.00 | -4.90 |
*
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
