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Lake/Bay Elevation Sensors 103
100 Clear Lake 2nd Outlet @ SH 146
Key Map 620T
Sensor ID 103 104
Sensor Type USGS Bubbler USGS Bubbler
Sensor Position Clear Lake Galveston Bay
Installed 3/13/1998 3/13/1998
TOB 7.70' 7.70'
Flooding Likely 7.70' 7.70'
Flooding Possible 4.70' 4.70'
Bottom of Lake/Bay -11.87' -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 -0.60'
As of July 1, 2007, the elevation datum was changed from 1929 NGVD, 1978 adjustment to the 1988 NAVD, 2001 adjustment.

Gate Status: CLOSED 9/23/2019 10:15 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 2.34' on 5/25/2020 5:51 PM
Galveston Bay is 2.25' on 5/25/2020 5:49 PM
Export to Excel
2 Days
Sensor
Reading Date
Elevation
1035/25/2020 5:51 PM2.34'
1035/25/2020 4:31 PM2.44'
1035/25/2020 3:21 PM2.58'
1035/25/2020 3:01 PM2.62'
1035/25/2020 2:45 PM2.69'
1035/25/2020 1:25 PM2.59'
1035/25/2020 1:15 PM2.71'
1035/25/2020 12:49 PM2.60'
1035/25/2020 12:01 PM2.49'
1035/25/2020 11:33 AM2.38'
1035/25/2020 11:01 AM2.28'
1035/25/2020 10:45 AM2.26'
1035/25/2020 10:13 AM2.14'
1035/25/2020 9:13 AM2.02'
1035/25/2020 8:37 AM1.92'
1035/25/2020 7:57 AM1.81'
1035/25/2020 7:43 AM1.70'
1035/25/2020 7:13 AM1.57'
1035/25/2020 7:01 AM1.54'
1035/25/2020 6:49 AM1.45'
1035/25/2020 4:57 AM1.34'
1035/25/2020 4:45 AM1.45'
1035/25/2020 4:37 AM1.35'
1035/25/2020 4:01 AM1.45'
1035/25/2020 3:13 AM1.56'
1035/25/2020 3:01 AM1.61'
1035/25/2020 2:31 AM1.67'
1035/25/2020 1:45 AM1.77'
1035/25/2020 1:21 AM1.87'
1035/25/2020 12:39 AM1.98'
1035/25/2020 12:27 AM2.09'
1035/24/2020 11:49 PM2.19'
1035/24/2020 11:13 PM2.30'
1035/24/2020 11:01 PM2.38'
1035/24/2020 10:03 PM2.40'
1035/24/2020 9:25 PM2.29'
1035/24/2020 9:19 PM2.42'
1035/24/2020 8:45 PM2.58'
1035/24/2020 8:33 PM2.43'
1035/24/2020 7:01 PM2.57'
1035/24/2020 6:31 PM2.55'
1035/24/2020 5:49 PM2.65'
1035/24/2020 5:07 PM2.55'
1035/24/2020 4:33 PM2.65'
1035/24/2020 4:19 PM2.54'
1035/24/2020 3:01 PM2.61'
1035/24/2020 2:45 PM2.65'
1035/24/2020 1:43 PM2.55'
1035/24/2020 12:37 PM2.42'
1035/24/2020 11:45 AM2.31'
1035/24/2020 11:15 AM2.20'
1035/24/2020 11:01 AM2.14'
1035/24/2020 10:43 AM2.10'
1035/24/2020 10:03 AM1.99'
1035/24/2020 9:33 AM1.88'
1035/24/2020 9:15 AM1.78'
1035/24/2020 8:45 AM1.68'
1035/24/2020 8:15 AM1.56'
1035/24/2020 7:39 AM1.44'
1035/24/2020 7:15 AM1.33'
1035/24/2020 7:01 AM1.28'
1035/24/2020 6:43 AM1.23'
1035/24/2020 6:09 AM1.12'
1035/24/2020 5:27 AM1.00'
1035/24/2020 4:39 AM0.90'
1035/24/2020 3:07 AM0.79'
1035/24/2020 3:01 AM0.82'
1035/24/2020 1:49 AM0.90'
1035/24/2020 1:01 AM1.03'
1035/24/2020 12:21 AM1.13'
1035/23/2020 11:37 PM1.23'
1035/23/2020 11:01 PM1.32'
1035/23/2020 10:51 PM1.33'
1035/23/2020 10:07 PM1.44'
1035/23/2020 8:57 PM1.56'
1035/23/2020 8:07 PM1.67'
1035/23/2020 7:03 PM1.79'
1035/23/2020 7:01 PM1.80'
1045/25/2020 5:49 PM2.25'
1045/25/2020 5:27 PM2.14'
1045/25/2020 4:51 PM2.30'
1045/25/2020 4:31 PM2.18'
1045/25/2020 4:15 PM2.48'
1045/25/2020 3:21 PM2.37'
1045/25/2020 3:01 PM2.33'
1045/25/2020 2:39 PM2.25'
1045/25/2020 2:19 PM2.12'
1045/25/2020 2:01 PM2.00'
1045/25/2020 1:21 PM2.11'
1045/25/2020 1:03 PM2.21'
1045/25/2020 11:37 AM2.50'
1045/25/2020 11:19 AM2.38'
1045/25/2020 11:01 AM2.31'
1045/25/2020 10:57 AM2.27'
1045/25/2020 10:25 AM2.14'
1045/25/2020 10:19 AM2.32'
1045/25/2020 10:09 AM2.21'
1045/25/2020 9:39 AM2.10'
1045/25/2020 9:33 AM1.97'
1045/25/2020 9:25 AM2.12'
1045/25/2020 9:07 AM2.01'
1045/25/2020 9:03 AM1.88'
1045/25/2020 9:01 AM2.19'
1045/25/2020 8:57 AM2.07'
1045/25/2020 8:55 AM2.21'
1045/25/2020 8:45 AM2.03'
1045/25/2020 8:43 AM1.93'
1045/25/2020 8:37 AM2.05'
1045/25/2020 8:31 AM2.20'
1045/25/2020 7:27 AM2.08'
1045/25/2020 7:09 AM1.96'
1045/25/2020 7:01 AM1.88'
1045/25/2020 6:57 AM1.83'
1045/25/2020 6:49 AM1.72'
1045/25/2020 6:33 AM1.62'
1045/25/2020 6:25 AM1.51'
1045/25/2020 6:19 AM1.41'
1045/25/2020 6:09 AM1.24'
1045/25/2020 5:55 AM1.14'
1045/25/2020 5:37 AM1.04'
1045/25/2020 5:31 AM1.22'
1045/25/2020 5:15 AM1.10'
1045/25/2020 5:07 AM1.00'
1045/25/2020 4:57 AM0.87'
1045/25/2020 4:45 AM1.01'
1045/25/2020 4:31 AM1.14'
1045/25/2020 4:15 AM1.36'
1045/25/2020 3:45 AM1.25'
1045/25/2020 3:01 AM1.45'
1045/25/2020 2:57 AM1.42'
1045/25/2020 2:49 AM1.30'
1045/25/2020 2:25 AM1.47'
1045/25/2020 2:09 AM1.59'
1045/25/2020 12:49 AM1.46'
1045/25/2020 12:37 AM1.34'
1045/25/2020 12:33 AM1.53'
1045/25/2020 12:31 AM1.67'
1045/25/2020 12:01 AM1.90'
1045/24/2020 11:43 PM2.01'
1045/24/2020 11:09 PM2.18'
1045/24/2020 11:01 PM2.25'
1045/24/2020 10:09 PM2.31'
1045/24/2020 9:51 PM2.20'
1045/24/2020 9:33 PM2.08'
1045/24/2020 9:07 PM2.18'
1045/24/2020 8:55 PM2.07'
1045/24/2020 8:09 PM1.95'
1045/24/2020 8:01 PM2.08'
1045/24/2020 7:43 PM2.21'
1045/24/2020 7:13 PM2.33'
1045/24/2020 7:01 PM2.58'
1045/24/2020 6:33 PM2.51'
1045/24/2020 5:57 PM2.39'
1045/24/2020 3:01 PM2.50'
1045/24/2020 2:19 PM2.52'
1045/24/2020 1:27 PM2.38'
1045/24/2020 1:21 PM2.24'
1045/24/2020 1:15 PM2.09'
1045/24/2020 1:01 PM1.93'
1045/24/2020 12:51 PM2.12'
1045/24/2020 12:49 PM2.01'
1045/24/2020 12:37 PM1.88'
1045/24/2020 12:33 PM1.99'
1045/24/2020 12:15 PM2.30'
1045/24/2020 12:09 PM2.44'
1045/24/2020 12:03 PM2.33'
1045/24/2020 11:57 AM2.16'
1045/24/2020 11:39 AM2.06'
1045/24/2020 11:15 AM2.18'
1045/24/2020 11:07 AM2.31'
1045/24/2020 11:03 AM2.16'
1045/24/2020 11:01 AM2.09'
1045/24/2020 10:49 AM2.03'
1045/24/2020 10:39 AM2.14'
1045/24/2020 10:13 AM2.31'
1045/24/2020 10:07 AM2.18'
1045/24/2020 9:57 AM2.32'
1045/24/2020 9:49 AM2.21'
1045/24/2020 9:43 AM2.32'
1045/24/2020 9:37 AM2.18'
1045/24/2020 8:55 AM2.02'
1045/24/2020 8:33 AM1.92'
1045/24/2020 8:15 AM2.03'
1045/24/2020 8:09 AM1.93'
1045/24/2020 7:15 AM1.77'
1045/24/2020 7:01 AM1.65'
1045/24/2020 6:55 AM1.63'
1045/24/2020 6:37 AM1.53'
1045/24/2020 6:25 AM1.42'
1045/24/2020 6:15 AM1.31'
1045/24/2020 6:07 AM1.19'
1045/24/2020 5:57 AM1.07'
1045/24/2020 5:51 AM1.19'
1045/24/2020 5:27 AM1.31'
1045/24/2020 5:03 AM1.18'
1045/24/2020 4:55 AM1.07'
1045/24/2020 4:49 AM0.97'
1045/24/2020 4:37 AM0.84'
1045/24/2020 4:33 AM0.73'
1045/24/2020 4:27 AM0.92'
1045/24/2020 4:21 AM1.07'
1045/24/2020 3:45 AM0.97'
1045/24/2020 3:07 AM0.86'
1045/24/2020 3:01 AM0.75'
1045/24/2020 2:33 AM0.85'
1045/24/2020 2:25 AM0.75'
1045/24/2020 2:15 AM0.86'
1045/24/2020 2:07 AM0.73'
1045/24/2020 2:01 AM0.87'
1045/24/2020 1:39 AM0.77'
1045/24/2020 1:27 AM0.89'
1045/24/2020 1:09 AM0.72'
1045/24/2020 1:07 AM0.62'
1045/24/2020 12:45 AM0.95'
1045/24/2020 12:33 AM0.83'
1045/24/2020 12:21 AM0.94'
1045/23/2020 11:21 PM1.13'
1045/23/2020 11:01 PM1.25'
1045/23/2020 10:27 PM1.24'
1045/23/2020 10:01 PM1.35'
1045/23/2020 9:43 PM1.49'
1045/23/2020 9:15 PM1.39'
1045/23/2020 8:55 PM1.54'
1045/23/2020 8:13 PM1.42'
1045/23/2020 8:09 PM1.70'
1045/23/2020 7:43 PM1.58'
1045/23/2020 7:37 PM1.69'
1045/23/2020 7:19 PM1.57'
1045/23/2020 7:01 PM1.78'
1045/23/2020 6:55 PM1.73'
1045/23/2020 6:43 PM1.63'
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'
High water mark elevations are approximate.