Monticello Reservoir: 89.8% full as of 2025-06-14

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

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 2025-06-14 89.8 338.20 31,211 31,211 34,740 1,838
Yesterday 2025-06-13 91.3 338.47 31,722 31,722 34,740 1,863
2 days ago 2025-06-12 91.4 338.49 31,760 31,760 34,740 1,864
1 week ago 2025-06-07 88.3 337.92 30,688 30,688 34,740 1,813
1 month ago 2025-05-14 86.4 337.55 30,009 30,009 34,740 1,779
3 months ago 2025-03-14 87.9 337.84 30,540 30,540 34,740 1,806
6 months ago 2024-12-14 79.7 336.24 27,702 27,702 34,740 1,661
1 year ago 2024-06-14 87.0 337.66 30,210 30,210 34,740 1,789
*

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 2025-06-14 09:15 338.06 340.00 -1.94
1 hour prior 2025-06-14 08:15 338.09 340.00 -1.91
2 hours prior 2025-06-14 07:15 338.10 340.00 -1.90
6 hours prior 2025-06-14 03:15 338.14 340.00 -1.86
12 hours prior 2025-06-13 21:15 338.30 340.00 -1.70
24 hours prior 2025-06-13 09:15 338.54 340.00 -1.46
48 hours prior 2025-06-12 09:15 338.42 340.00 -1.58
*

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

Lake Location