Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Gauge Information
Flood Categories (in feet)
Major Flood Stage:
26
Moderate Flood Stage:
13
Flood Stage:
9
Action Stage:
5
Historical Crests (1) 41.00 ft on 04/24/1956 (2) 31.65 ft on 06/27/2007 (3) 27.06 ft on 11/15/2001 (4) 24.60 ft on 09/03/1981 (5) 19.94 ft on 02/03/1986 Show More Historical Crests
Low Water Records
Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.
Extended rating:
Rating Curve Extension - The Rating Curve Extension is calculated by using either a linear, logarithmic, or hydraulic technique to extend the rating curve above the currently established relationship between stage and flow.
Flood Impacts
26
MAJOR LOWLAND FLOODING CLOSES MANY STREETS AND ROADS. MUCH OF THE CITY PARK DOWNSTREAM FLOODS. LOWEST HOMES ABOVE GEORGETOWN TO GRANGER LAKE ARE THREATENED
23
MODERATE LOWLAND FLOODING INUNDATES MANY SECONDARY AND PRIMARY ROADS NEAR THE SAN GABRIEL RIVER. FACILITIES AND EQUIPMENT WELL INTO THE FLOOD PLAIN ARE FLOODED. RESIDENTS OF LOWEST HOMES IN THE FLOOD PLAIN ABOVE GEORGETOWN TO GRANGER LAKE SHOULD MONITOR NOAA WEATHER RADIO FOR DEVELOPING HEAVY RAIN AND FLOOD CONDITIONS
20
MODERATE LOWLAND FLOODING CLOSES SECONDARY AND PRIMARY ROADS NEARTHE RIVER. THE CITY PARK IS SEVERELY FLOODED. LIVESTOCK AND EQUIPMENT SHOULD BE MOVED FROM THE FLOOD PLAIN FROM THE HEADWATERS TO GRANGER LAKE
17
MODERATE LOWLAND FLOODING INUNDATES MANY SECONDARY AND PRIMARY ROADS NEAR THE SAN GABRIEL RIVER FROM THE HEADWATERS OF THE SOUTH FORK TO GRANGER LAKE. THE CITY PARK IN GEORGETOWN AND ANY FACILITIES AND EQUIPMENT IN THE FLOOD PLAIN ARE DAMAGED
13
MODERATE LOWLAND FLOODING INUNDATES SECONDARY ROADS AND LOW BRIDGES. FLOW ENTERS THE LOWEST AREAS OF THE CITY PARK
9
MINOR LOWLAND FLOODING REACHES LOW AREAS OF THE FLOOD PLAIN WITH NO SIGNIFICANT DAMAGE. LOWEST AREAS OF THE CITY PARK DOWNTOWN ARE FLOODED
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Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.
