South Lamar Boulevard Bridge (TX Loop 343)

The South Lamar Boulevard Bridge in Austin, Texas spans Lady Bird Lake. Constructed from 1940 to 1942,2 the bridge was the second permanent bridge to cross the Colorado River and featured six open spandrel concrete arches.1 The crossing was added to the National Register of Historic Places on July 7, 1994.2

Significant growth in Austin, especially south of the Colorado River, resulted in the South Lamar Boulevard Bridge becoming overburdened. It featured ten-foot traffic lanes and narrow sidewalks, and no provisions for cyclists. The bridge’s location between downtown and a revitalizing Seaholm District, and the ever-growing park system to the south led the city to press for a bond issue.

As this article is specific to the South Lamar Boulevard Bridge, read onward to the development and construction of the Pfluger Pedestrian and Bicycle Bridge that was completed in 2001 »

  • Gallery
  • Statistics
  • Sources
  • Designation: South Lamar Boulevard Bridge, TX Loop 343
  • Crosses: Colorado River
  • Bridge Type: Open spandrel arch bridge
  • Total Length: 659 feet
  • Main Span Length: 110 feet
  • Deck Width: 40 feet
  1. “Lamar Boulevard Bridge.” Historic Bridge Foundation. N.p., 2003. Web. 7 Nov. 2012. Article.
  2. James D. Pfluger Pedestrian and Bicycle Bridge. N.p.: n.p., n.d. Scribd. Web. 7 Nov. 2012. Report.
    1. American Association of State Highway Transporation Officials (AASHTO), Standard Specifications for  Highway Bridges, 16th Edition, 1996, with Interim Updates through 1998.
    2. American Association of State Highway Transporation Officials (AASHTO), Guide Specifications for  Design of Pedestrian Bridges, August 1997.3.
    3. American Association of State Highway Transporation Officials (AASHTO), Guide Specifications for  Horizontally Curved Highway Bridges, 1993, with Interim Updates through 1995.4.
    4. National Steel Bridge Alliance (NSBA), “V-LOAD Analysis,” Highway Structures Design Handbook ,Volume 1, Chapter 12, pg. I/12/16, December 1996.5.
    5. Bridgesoft, Inc., “STLBRIDGE – Design of Continuous Steel Bridge Girders,” Omaha, Nebraska, 1997.6.
    6. Bridge Software Development International, Ltd. (BSDI), “Bridge-System (SM), 3D System,”Coopersburg, Pennsylvania, 1987.

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