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Stream Elevation Sensor 493
490 Keegans Bayou @ Keegan Road
Sensor ID 493
Sensor Type Bubbler
Installed 5/2/1984
Flooding Likely 78.90'
Flooding Possible 75.90'
Bottom of Stream 65.90'
Tip of Orifice 66.02'
Measuring Plate 81.05'
Benchmark 81.07'
RM 040420 stamped D118 BM05 located on the downstream sidewalk at stream centerline, 1988 NAVD, 2001 adjustment. 78 to 01 Adjustment -2.8'
As of July 1, 2007, the elevation datum was changed from 1929 NGVD, 1978 adjustment to the 1988 NAVD, 2001 adjustment.

The Stream Elevation  chart showing Stream Elevation Left series.
Cross Section
Stream Elevation for sensor 493 is 66.45'
Reading on 4/19/2024 3:40 PM
Export to Excel
2 Days
Sensor
Reading Date
Elevation
4934/19/2024 3:40 PM66.45'
4934/19/2024 11:40 AM66.45'
4934/19/2024 7:40 AM66.42'
4934/19/2024 4:40 AM66.43'
4934/19/2024 3:40 AM66.47'
4934/19/2024 12:32 AM66.54'
4934/18/2024 11:40 PM66.51'
4934/18/2024 7:40 PM66.47'
4934/18/2024 3:40 PM66.43'
4934/18/2024 11:40 AM66.44'
4934/18/2024 7:40 AM66.37'
4934/18/2024 5:22 AM66.43'
4934/18/2024 3:40 AM66.51'
4934/17/2024 11:40 PM66.58'
4934/17/2024 10:32 PM66.54'
4934/17/2024 7:40 PM66.48'
Flood Frequency
Elevation
10% (10-year)78.20'
2% (50-year)79.50'
1% (100-year)79.90'
.2% (500-year)80.80'
Historical Storm
Date
Event
Elevation
9/13/2008Ike75.60'
4/28/2009 75.90'
1/9/2012 78.90'
5/26/2015 80.80'
4/18/2016 80.50'
8/27/2017Harvey80.20'
9/21/2020Beta78.10'
High water mark elevations are approximate.
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