Region 10 Lower Colorado-Lavaca Flood Planning Region

As the lower Colorado River emerges from O.H. Ivie Reservoir, it crosses the High Plains and Cross Timbers ecoregions on its way to the Edwards Plateau. The San Saba, Llano, Pedernales Rivers and their many tributaries all feed the lower Colorado as it passes through the Highland Lakes of central Texas. The lower Colorado makes its final dam crossing at the end of Lady Bird Lake in Austin on its way to Matagorda Bay. From its headwaters in Gonzales County, the Lavaca River flows to Lavaca Bay, which drains to the Gulf of Mexico. There are 20 major lakes and reservoirs in the Lower Colorado-Lavaca region, and no other river system crosses as many ecoregions along its course.

For a detailed map of Region 10, please visit the Texas Geographic Information Office (TxGIO) Flood Planning Regions Map Collection.

Go to Region 10 Lower Colorado-Lavaca RFPG External Host Website

Population Estimate (2019): 1,877,786

Approximate Area: 24,380 square miles

Approximate Stream Miles: 20,493

Approximate NFIP Claims (1975-2019): $354,032,694

Counties Represented:

• Austin*
• Bastrop*
• Blanco*
• Brazoria*
• Brown*
• Burnet*
• Caldwell*
• Calhoun*
• Callahan*
• Coleman*
• Colorado
• Comanche*
• Concho*
• De Witt*
• Eastland*
• Edwards*
• Fayette*
• Fort Bend*
• Gillespie*
• Gonzales*
• Hays*
• Jackson
• Kendall*
• Kerr*
• Kimble
• Lampasas*
• Lavaca*
• Lee*
• Llano
• Mason
• Matagorda
• McCulloch
• Menard*
• Mills*
• Real*
• Runnels*
• San Saba
• Schleicher*
• Sutton*
• Taylor*
• Travis*
• Victoria*
• Wharton

*indicates this county is partially within this RFPG and is also represented by at least one other RFPG

Major Cities (Population greater than 25,000):

• Austin*
• Cedar Park*
• Leander*
• Pflugerville
• Rosenberg*
• Round Rock*
• Victoria*

*indicates this city is partially within this RFPG and is also represented by at least one other RFPG

Major Lakes & Reservoirs:

• Brady Creek Reservoir
• Cedar Creek Reservoir Colorado
• Cox Lake / Raw Water Lake / Recycle Lake
• Eagle Lake
• Hords Creek Lake
• Inks Lake
• Lake Austin
• Lake Bastrop
• Lake Brownwood
• Lake Buchanan
• Lake Clyde
• Lake Coleman
• Lake Lyndon B Johnson
• Lake Marble Falls
• Lake Texana
• Lake Travis
• Lake Walter E Long
• Mud Lake No. 4
• O H Ivie Reservoir
• South Texas Project Reservoir

Ecoregions of Texas Represented:

• Blackland Prairie
• Cross Timbers
• Edwards Plateau
• Gulf Prairies
• Post Oak Savanah
• Rolling Plains