Monticello Reservoir: 77.0% full as of 2026-08-23
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 | 2026-08-23 | 77.0 | 335.66 | 26,737 | 26,737 | 34,740 | 1,612 |
| Yesterday | 2026-08-22 | 77.0 | 335.66 | 26,737 | 26,737 | 34,740 | 1,612 |
| 2 days ago | 2026-08-21 | 77.1 | 335.68 | 26,769 | 26,769 | 34,740 | 1,614 |
| 1 week ago | 2026-08-16 | 77.7 | 335.82 | 26,996 | 26,996 | 34,740 | 1,624 |
| 1 month ago | 2026-07-23 | 80.3 | 336.36 | 27,907 | 27,907 | 34,740 | 1,672 |
| 3 months ago | 2026-05-23 | 81.3 | 336.55 | 28,234 | 28,234 | 34,740 | 1,689 |
| 6 months ago | 2026-02-23 | 78.7 | 336.02 | 27,330 | 27,330 | 34,740 | 1,641 |
| 1 year ago | 2025-08-23 | 81.6 | 336.61 | 28,338 | 28,338 | 34,740 | 1,694 |
*
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 | 2026-08-23 18:15 | 335.65 | 340.00 | -4.35 |
| 1 hour prior | 2026-08-23 17:15 | 335.65 | 340.00 | -4.35 |
| 2 hours prior | 2026-08-23 16:15 | 335.65 | 340.00 | -4.35 |
| 6 hours prior | 2026-08-23 12:15 | 335.66 | 340.00 | -4.34 |
| 12 hours prior | 2026-08-23 06:15 | 335.68 | 340.00 | -4.32 |
| 24 hours prior | 2026-08-22 18:15 | 335.64 | 340.00 | -4.36 |
| 48 hours prior | 2026-08-21 18:15 | 335.68 | 340.00 | -4.32 |
*
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
