In central Kerr County, up to 10 inches of rain inundated the area, causing the Guadalupe River to swell and overflow its banks.

The Pedernales River has "risen several feet and is flowing at several thousand cubic feet of water per minute," according to a post by park officials. The increase prompted a closure of all river trails and the Trammel Crossing and Cypress Mill Loop.

The San Marcos Creek Project broke ground nearly five years ago, adding two bridges, a levee and more than a mile of storm drains to stop potential flooding in the area.

SAN MARCOS, Calif. (FOX 5/KUSI) — After the project was decades the making, improvements to the San Marcos Creek are now complete. The creek runs east to west between San Marcos Boulevard and ...

Photos and videos from FOX 7 viewers show widespread damage amid deadly flooding in Travis, Williamson and Burnet counties.

Hays County, including San Marcos, is under a flash flood warning until 1 p.m., according to the National Weather Service (NWS).  The NWS stated that as of 9:46 a.m., 1-2 inches of rain have fallen. NWS expects a rainfall rate of 2-4 inches in 1 hour.

Central Texas is  known as 'Flash Flood Alley.' Recent floods in San Antonio, Kerrville, Austin and elsewhere a reminder of a long, tragic history of flash flooding.

Search crews slogged through thick mud and debris Tuesday in central Texas, where more than 100 people are confirmed dead after catastrophic flooding.