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Creek/Bay Elevation Sensors 169
170 Clear Creek @ Nassau Bay
Sensor ID 169 173
Sensor Type Bubbler Bubbler
Sensor Position Clear Creek Lake Nassau
Installed 2/26/1985 2/26/1985
Flooding Likely 6.00' 6.00'
Flooding Possible 5.00' 5.00'
Bottom of Creek/Bay -2.50' -1.70'
Tip of Orifice 0.01' 0.92'
Measuring Plate 2.92' 8.74'
Benchmark 7.51' 7.51'
RM 010043 stamped A100 BM 06 located at the south end of headwall of flap gate structure at the west end of Lake Nassau, 1988 NAVD, 2001 adjustment. 78 to 01 Adjustment -0.8'
As of July 1, 2007, the elevation datum was changed from 1929 NGVD, 1978 adjustment to the 1988 NAVD, 2001 adjustment.

The Creek/Bay Elevation chart showing Creek/Bay Elevation Left series, Stream Elevation Right series.
Cross Section
Creek/Bay Elevation for sensors
Clear Creek is 1.07' on 5/9/2025 11:11 PM
Lake Nassau is 2.97' on 5/9/2025 11:11 PM
Export to Excel
1 Hour
Sensor
Reading Date
Elevation
1695/9/2025 11:11 PM1.07'
1735/9/2025 11:11 PM2.97'
Flood Frequency
Elevation
10% (10-year)6.80'
2% (50-year)10.10'
1% (100-year)11.70'
.2% (500-year)15.00'
Historical Storm
Date
Event
Elevation
9/16/2008Ike11.10'
4/18/2009 4.80'
8/27/2017Harvey10.00'
9/21/2020Beta5.90'
7/8/2024Beryl6.30'
High water mark elevations are approximate.
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