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Stream Elevation Sensor 418
420 Brays Bayou @ South Main Street
Sensor ID 418
Sensor Type USGS Radar
Installed 4/27/1984
Flooding Likely 41.00'
Flooding Possible 38.00'
Bottom of Stream 13.60'
Tip of Orifice 47.19'
Measuring Plate 50.09'
External Link USGS
Water Level Forecast Information NWS
Benchmark 46.53'
RM 040125 stamped D100 D-9A located on the downstream sidewalk at stream centerline, 1988 NAVD, 2001 adjustment. 78 to 01 Adjustment -1.39
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 418 is 16.77'
Reading on 11/23/2024 6:29 AM
Export to Excel
2 Days
Sensor
Reading Date
Elevation
41811/23/2024 6:29 AM16.77'
41811/23/2024 6:05 AM16.77'
41811/23/2024 2:29 AM16.87'
41811/22/2024 11:53 PM16.87'
41811/22/2024 10:29 PM16.86'
41811/22/2024 6:29 PM16.83'
41811/22/2024 2:29 PM16.82'
41811/22/2024 10:29 AM16.78'
41811/22/2024 6:29 AM16.77'
41811/22/2024 2:29 AM16.92'
41811/21/2024 10:29 PM16.85'
41811/21/2024 6:29 PM16.86'
41811/21/2024 2:29 PM16.87'
41811/21/2024 12:55 PM16.87'
41811/21/2024 10:29 AM16.82'
Flood Frequency
Elevation
10% (10-year)41.00'
2% (50-year)43.10'
1% (100-year)45.70'
.2% (500-year)50.00'
Historical Storm
Date
Event
Elevation
6/18/1973 41.20'
8/31/1981 41.50'
8/18/1983Alicia37.40'
9/19/1983 42.40'
8/1/1989Chantal38.80'
10/18/1994 42.20'
9/11/1998Frances39.60'
6/9/2001Allison #242.90'
11/17/2003 40.60'
9/13/2008Ike41.30'
4/28/2009 36.50'
1/9/2012 40.50'
5/26/2015 42.90'
4/18/2016 42.10'
8/27/2017Harvey45.70'
9/21/2020Beta39.80'
7/8/2024Beryl41.80'
High water mark elevations are approximate.
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