Lake Sulphur Springs: 71.9% full as of 2021-09-25

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 2021-09-25 71.9 455.91 12,762 12,762 17,747 - n.a. -
Yesterday 2021-09-24 72.0 455.92 12,776 12,776 17,747 - n.a. -
2 days ago 2021-09-23 72.1 455.94 12,803 12,803 17,747 - n.a. -
1 week ago 2021-09-18 72.9 456.04 12,943 12,943 17,747 - n.a. -
1 month ago 2021-08-25 79.3 456.80 14,073 14,073 17,747 - n.a. -
3 months ago 2021-06-25 95.4 458.50 16,926 16,926 17,747 - n.a. -
6 months ago 2021-03-25 100.0 459.23 18,297 17,747 17,747 - n.a. -
1 year ago 2020-09-25 77.6 456.60 13,776 13,776 17,747 - n.a. -
*

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 2021-09-25 07:30 455.91 458.95 -3.04 below flood pool
1 hour prior 2021-09-25 06:30 455.91 458.95 -3.04 below flood pool
2 hours prior 2021-09-25 05:30 455.91 458.95 -3.04 below flood pool
6 hours prior 2021-09-25 01:30 455.91 458.95 -3.04 below flood pool
12 hours prior 2021-09-24 19:30 455.92 458.95 -3.03 below flood pool
24 hours prior 2021-09-24 07:30 455.91 458.95 -3.04 below flood pool
48 hours prior 2021-09-23 07:30 455.94 458.95 -3.01 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1973-01-01
Vertical datum NGVD29
Gauge USGS:07343460
Service spillway crest elevation 441.00 ft above NGVD29
Service spillway crest elevation 457.00 ft above NGVD29
Top of flood gate elevation 441.00 ft above NGVD29
Emergency spillway crest elevation 462.00 ft above NGVD29
Top of dam elevation 474.00 ft above NGVD29
Conservation pool elevation 458.95 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1973-01-01 (source: usgs)

Lake Location