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Lake/Bay Elevation Sensors 103
100 Clear Lake 2nd Outlet @ SH 146
Sensor ID 103 104
Sensor Type USGS Bubbler USGS Bubbler
Sensor Position Clear Lake Galveston Bay
Installed 3/13/1998 3/13/1998
Flooding Likely 7.70' 7.70'
Flooding Possible 4.70' 4.70'
Bottom of Lake/Bay -11.90' -9.00'
Tip of Orifice -3.30' -5.22'
Measuring Plate 7.69' 7.61'
External Link USGS USGS
Benchmark 7.69' 7.69'
RM 010013 stamped A200 BM01 located on the upstream lake side top of concrete walkway at N end of outlet gates, 78 to 01 Adjustment -0.6'
As of July 1, 2007, the elevation datum was changed from 1929 NGVD, 1978 adjustment to the 1988 NAVD, 2001 adjustment.

Gate Status: CLOSED 1/25/2024 9:24 AM
The Lake/Bay Elevation  chart showing Lake/Bay Elevation Left series, Stream Elevation Right series.
Cross Section
Lake/Bay Elevation for sensors
Clear Lake is 1.22' on 3/18/2024 11:01 PM
Galveston Bay is 1.12' on 3/18/2024 11:31 PM
Export to Excel
1 Hour
Sensor
Reading Date
Elevation
1033/18/2024 11:01 PM1.22'
1043/18/2024 11:31 PM1.12'
1043/18/2024 11:13 PM1.25'
Flood Frequency
Elevation
10% (10-year)5.80'
2% (50-year)9.90'
1% (100-year)11.60'
.2% (500-year)15.00'
Historical Storm
Date
Event
Elevation
9/16/2007Erin3.00'
9/16/2008Ike11.40'
4/18/2009 3.80'
8/27/2017Harvey6.00'
9/21/2020Beta5.10'
High water mark elevations are approximate.
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