Monticello Reservoir: 78.6% full as of 2026-08-08
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 | 2026-08-08 | 78.6 | 336.00 | 27,296 | 27,296 | 34,740 | 1,639 |
| 1 day prior | 2026-08-07 | 78.5 | 335.99 | 27,280 | 27,280 | 34,740 | 1,638 |
| 2 days prior | 2026-08-06 | 78.7 | 336.02 | 27,330 | 27,330 | 34,740 | 1,641 |
| 1 week prior | 2026-08-01 | 79.2 | 336.13 | 27,516 | 27,516 | 34,740 | 1,651 |
| 1 month prior | 2026-07-08 | 81.2 | 336.53 | 28,199 | 28,199 | 34,740 | 1,687 |
| 3 months prior | 2026-05-08 | 81.0 | 336.50 | 28,148 | 28,148 | 34,740 | 1,684 |
| 6 months prior | 2026-02-08 | 78.4 | 335.97 | 27,246 | 27,246 | 34,740 | 1,636 |
| 1 year prior | 2025-08-08 | 82.6 | 336.82 | 28,704 | 28,704 | 34,740 | 1,713 |
*
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 | 2026-08-08 23:15 | 336.02 | 340.00 | -3.98 |
| 1 hour prior | 2026-08-08 22:15 | 336.01 | 340.00 | -3.99 |
| 2 hours prior | 2026-08-08 21:15 | 336.02 | 340.00 | -3.98 |
| 6 hours prior | 2026-08-08 17:15 | 336.03 | 340.00 | -3.97 |
| 12 hours prior | 2026-08-08 11:15 | 336.00 | 340.00 | -4.00 |
| 24 hours prior | 2026-08-07 23:15 | 336.00 | 340.00 | -4.00 |
| 48 hours prior | 2026-08-06 23:15 | 336.00 | 340.00 | -4.00 |
*
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
