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Stream Elevation Sensor 233
230 Big Island Slough @ Fairmont Parkway
Sensor ID 233
Sensor Type Pressure Transducer
Installed 4/5/1986
Flooding Likely 16.90'
Flooding Possible 13.90'
Bottom of Stream 0.90'
Tip of Orifice 1.06'
Measuring Plate 21.24'
Benchmark 21.25'
RM 020170 stamped B106 BM02 located on the downstream sidewalk of the east bound lanes at stream centerline, 1988 NAVD, 2001 adjustment. 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.

The Stream Elevation chart showing Stream Elevation Left series.
Cross Section
Stream Elevation for sensor 233 is 1.06'
Reading on 12/5/2025 10:18 PM
Export to Excel
2 Days
Sensor
Reading Date
Elevation
23312/5/2025 10:18 PM1.06'
23312/5/2025 7:20 PM1.05'
23312/5/2025 6:18 PM1.06'
23312/5/2025 2:18 PM1.06'
23312/5/2025 10:18 AM1.06'
23312/5/2025 6:18 AM1.06'
23312/5/2025 2:18 AM1.07'
23312/4/2025 10:18 PM1.19'
23312/4/2025 6:18 PM1.07'
23312/4/2025 2:18 PM1.07'
23312/4/2025 10:46 AM1.15'
23312/4/2025 10:18 AM1.25'
23312/4/2025 10:16 AM1.26'
23312/4/2025 9:46 AM1.37'
23312/4/2025 9:16 AM1.48'
23312/4/2025 8:54 AM1.59'
23312/4/2025 8:28 AM1.70'
23312/4/2025 8:00 AM1.82'
23312/4/2025 7:10 AM1.92'
23312/4/2025 6:24 AM2.03'
23312/4/2025 6:18 AM2.04'
23312/4/2025 5:46 AM2.14'
23312/4/2025 5:14 AM2.24'
23312/4/2025 3:18 AM2.35'
23312/4/2025 2:52 AM2.46'
23312/4/2025 2:18 AM2.53'
23312/4/2025 1:46 AM2.56'
23312/4/2025 1:14 AM2.45'
Flood Frequency
Elevation
10% (10-year)13.40'
2% (50-year)16.10'
1% (100-year)17.00'
.2% (500-year)19.40'
Historical Storm
Date
Event
Elevation
7/25/1979Claudette17.40'
6/5/1981 12.80'
8/18/1983Alicia7.90'
8/1/1989Chantal14.00'
6/9/2001Allison #216.90'
6/19/2006 10.90'
10/16/2006 13.60'
8/16/2007Erin13.30'
9/13/2008Ike13.10'
4/18/2009 12.90'
8/27/2017Harvey15.50'
High water mark elevations are approximate.
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