San Gabriel River at Georgetown South Fork

1. 41.00 ftFlood of record from April 24, 1956. Catastrophic flooding from Georgetown to Granger Lake. Residences along San Gabriel Village Blvd near the merger of the north and south forks of the San Gabriel River in Georgetown flood. Georgetown Parks and Recreation Administration buildings have become isolated. Flood waters have reached the bottom of the Ronald W Reagan Blvd bridge. Interstate 35 and the Southwest Bypass are the few bridges between Georgetown and Granger Lake that have not been overtopped.
2. 37.00 ftMajor lowland flooding is ongoing with flood waters up to the borrom of bridges on State Highway 29 bridge between Georgetown and Jonah, and North Austin Ave in Georgetown. The bridges on FM 1660 south of Jonah and North County Road 366 have flooded. South Rock Street in Georgetown, near Blue Hole Park, has flooded.
3. 31.00 ftMajor lowland flooding has reached the height of the June 27, 2007 flood. Secondary roads that cross the river are starting to be impacted by flood waters. The approaches of County Road 279 are flooded, and water has reached the botttom of the County Road 366 bridge.
4. 28.00 ftMajor lowland flooding threatens residences near the floodplain between Libery Hill and Georgetown. Lowest parts of Orchard Drive and County Road 270 flood.
5. 26.00 ftMajor lowland flooding closes many streets and roads. Much of San Gabriel Park downstream floods. Homes in the lowest portions of the floodplain from above Georgetown to Jonah to Granger Lake along the San Gabriel are likely flooded. County Road 100 between State Highway 29 and McShepherd Road has flooded.
6. 23.00 ftModerate 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.
7. 20.00 ftModerate lowland flooding closes secondary and primary roads near the river upstream of Georgetown to Granger Lake. San Gabriel Park is severely flooded.
8. 17.00 ftModerate lowland flooding inundates many secondary and primary roads near the San Gabriel River from the headwaters of the South Fork to Granger Lake. Lowest pavillions and playground equipment in the San Gabriel Park have flooded. Flow threatens to flood County Road 100 between State Highway 29 and McSheperd Road near Jonah.
9. 13.00 ftModerate lowland flooding inundates secondary roads and low water crossings from above Georgetown to Lake Granger. Flow enters the lowest areas of San Gabriel Park in Georgetown, and Blue Hole Park Road and restrooms have flooded.
10. 9.00 ftMinor lowland flooding reaches low areas of the floodplain and overtops pedestrian bridges of the San Gabriel Park in Georgetown. Residents of lowest homes in the floodplain above Georgetown to Granger Lake should monitor NOAA Weather Radio for developing heavy rain and flood conditions.
11. 7.00 ftFlow exceeds the lowest sections of the banks within the floodplain, breaks banks for lowest sections of Blue Hole Park, and flow overtops the lowest pedestrian bridge in San Gabriel Park.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.

Most recent crests

• July 5, 2025: 37.36 ft
• May 7, 2025: 6.78 ft
• May 8, 2019: 9.29 ft
• October 16, 2018: 16.88 ft
• September 22, 2018: 23.93 ft
• October 31, 2015: 11.28 ft
• May 26, 2015: 15.75 ft
• May 24, 2015: 17.12 ft
• March 20, 2012: 10.06 ft
• September 8, 2010: 21.98 ft

• UpstreamSouth Fork San Gabriel River
• DownstreamSan Gabriel River
• North Fork of the San Gabriel River
• San Gabriel River at Lake Georgetown
• Berry Creek at Georgetown
• Brushy Creek at Cedar Park
• Brushy Creek at I-35 Round Rock
• Brushy Creek at Kenney Fort Blvd nr Round Rock
• North Fork San Gabriel River at Ronald Reagan Blvd near Leander 8N

Forecasts by the West Gulf River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.