Blanco Riverine Flood Mitigation Project

This project was identified in 2017 as a means to reduce flood flows from the Blanco River that currently exit the river in the Blanco Gardens subdivision and flow through the neighborhood toward the San Marcos River. This overflow occurs in events as low 5% annual chance (20-year) flood event.

In response to the Memorial Day Floods and All Saints Floods of 2015, San Marcos has received $33.8M in Housing and Urban Development (HUD) Community Development Block Grant Disaster Recovery funds (CDBG-DR). Partial funding for this project was allocated from the CDBG-DR funds. Learn more about the City’s CDBG Disaster Recovery Program.

Public Meeting Presentations

  • Public Meeting - Environmental Document - held February 6, 2020
  • Completed Preliminary Engineering Report
  • 60% Final Design Completed
  • 90% Final Design In-Progress
  • Completed Engineering Feasibility Report and submitted to Texas Water Development Board
  • Completed Environmental Information Document and submitted to Texas Water Development Board
  • Environmental Assessment and Request for Release of Funds (RROF) approved by HUD
  • Acquisition Process is In-Progress

On September 12, 2018, the second Blanco Riverine Flood Mitigation community meeting was held at the San Marcos Activity Center. Below are links to the presentation given at the meeting, in English and Spanish:

September 12 Community Meeting Presentation - English (PDF)

September 12 Community Meeting Presentation - Spanish (PDF)

  • Design and Land Acquisition: Fall 2019 to Spring 2021
  • Construction: to be determined

Budget: $23 million

Current Funding:

  • TWDB = $1,961,821
  • CDBG-DR (2017) = $5,385,213
  • City (2019) = $2,628,800

Project Manager: Jacque Thomas

For more information on this, or any other City Project, email Engineering Information.

Blanco Riverine Flood Mitigation Project Public Meeting February 6, 2020 Presentation (PDF)
December 4, 2019 Community Meeting: Blanco Gardens Drainage Improvements Presentation (PDF)

Project Status - 

  • Public Meeting - Environmental Document - February 6, 2020 - 6:00 pm at Activity Center, 501 E Hopkins
  • Completed Draft Preliminary Engineering Report
  • Completed Draft Engineering Feasibility Report and submitted to Texas Water Development Board
  • Applied for additional funding for project through TWDB
  • Completed DRAFT Environmental Information Document and submitted to Texas Water Development Board
  • Environmental Assessment in progress for submittal to HUD
Proposed Blanco Riverine Mitigation 121518