A Flood Warning continues for the Blanco River in Hays County. Details by location are as follows:
...At Fischer...
Current stage: 12.3 ft
Flood stage: 17.0 ft
The river is expected to crest just above flood stage later this evening, then recede overnight, falling just below flood stage during the pre-dawn hours on Thursday.
Applicable flood guidance based on previous history (note that guidance for 1 level above the current forecast crest is provided for precautionary/preparedness purposes):
At 23 feet: Lowest homes are threatened. Water begins to cut off secondary roadways near the river.
At 17 feet: Roadways and low bridges along the river are flooded. Vehicles cannot pass. Livestock can be stranded.
At 12 feet: Overbank conditions may cut off livestock in low areas.
...At Wimberley...
Current stage: 8.7 ft
Flood stage: 13.0 ft
The river is expected to crest near 20 feet later this evening, then recede overnight into pre-dawn Thursday. The river is expected to drop just below flood stage near dawn on Thursday.
Applicable flood guidance based on previous history (note that guidance for 1 level above the current forecast crest is provided for precautionary/preparedness purposes):
At 21 feet: Water recreation is very dangerous above Blanco to the San Marcos River confluence, including John Knox Camp and Dudley Johnson Park at Five Mile Dam above San Marcos. Secondary roads and bridges in the flood plain are very dangerous to motorists. Hydraulic jumps behind low dams are dangerous to canoeists and kayakers as they may become trapped.
At 17 feet: Water recreation in the Blanco river is dangerous from above Blanco to the San Marcos river confluence. Secondary roads and bridges in the flood plain are flooded and dangerous. Much of Dudley Johnson park at Five Mile Dam is flooded.
At 13 feet: Minor lowland flooding reaches secondary roads. Low bridges and crossings from the headwaters to the San Marcos River confluence near San Marcos flood and are dangerous. Property in low lying areas of the Blanco and San Marcos Rivers should be moved to higher ground. Swimming and tubing are life threatening due to turbulence. Hydraulic jumps behind low water dams can trap canoeists and kayakers between the dam and the hydraulic jump and can be life threatening.
At 10 feet: A fast moving rise down the Blanco River can make swimming and canoeing dangerous above Blanco to below San Marcos. Especially in areas where steep banks make getting out of the river dangerous. Low dams create hydraulic jumps which can trap canoeists and kayakers between the dam and the jump.
At 7 feet: Overbank conditions begin to threaten swimmers and tubers in recreation areas above Blanco to the San Marcos River confluence below San Marcos.
At 6 feet: Low lying areas and crossings of secondary roads flood near and below Blanco to below Wimberley including Farm to Market 178 just above Wimberley.
...At San Marcos...
Current stage: 10.32 ft
Flood stage: 18.0 ft
The river is expected to crest near 22.5 feet during the pre-dawn hours of Thursday morning, then recede during the daytime hours on Thursday, falling just below flood stage near 12 Noon.
Applicable flood guidance based on previous history (note that guidance for 1 level above the current forecast crest is provided for precautionary/preparedness purposes):
At 24 feet: Lowest homes are threatened. Water beings to cut off secondary roads near the river.
At 18 feet: Roadways and low bridges along the river are flooded. Vehicles cannot pass. Livestock can be stranded.
At 13 feet: Overbank conditions may cut off livestock and low bridges near the river.
***PLEASE NOTE: ALL of the above forecasts are based on current conditions and short term forecast information. Should additional heavy rainfall occur upstream earlier or in greater quantity than currently expected, the forecast levels and timing could change. We will continue to monitor the situation and issue additional updates as warranted.
Also, additional heavy rainfall later this week will result in additional and/or renewed flooding issues at times across the area through this coming weekend. We will continue monitoring the situation and issue updates as conditions warrant.
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