03.a - 2100 Barton Springs Rd - Historic Narrative — original pdf

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DRAFT Historic Narrative1 Barton Springs Bridge Zilker Park Historic District Austin, Travis County, Texas Completed 1926 (Widened 1946) Summary The Barton Springs Bridge (1926) is historically and architecturally significant for its association with the development of Austin’s early twentieth-century civic infrastructure and for its embodiment of the open-spandrel reinforced concrete arch bridge type as designed by prominent Texas engineer Terrell Bartlett. Bartlett is still considered a pioneer in bridge design. The bridge represents an important phase in Austin’s expansion of permanent, modern transportation infrastructure and is a contributing structure within the broader historic landscape of the Zilker Park. The architectural amenities of the park are a unique collection of buildings, bridges, pergolas, fencing, railings, shelters, picnic facilities, comfort stations and concession stands and others that together create an engaging and vibrant gathering place central to Austin’s history and development. Completed in June 1926, the bridge replaced an earlier wood and iron structure described at the time as antiquated and unsafe. Its construction marked the first major bridge built in Austin since the Congress Avenue Bridge and was widely covered in local media and documented in City Council minutes, reflecting its civic importance. Designed by Terrell Bartlett Engineering Co. of San Antonio, the bridge is an early and well- documented example of the open-spandrel reinforced concrete arch form that became widely used throughout Texas in the early to mid-twentieth century. The bridge retains integrity of location, setting, design, materials, workmanship, feeling, and association. Civic Infrastructure and Park Development During the 1920s, Austin undertook significant improvements to public infrastructure in response to population growth, automobile use, and expanding recreational development in what would become Zilker Park. Barton Springs and the surrounding parklands were emerging as central civic amenities, necessitating safer and more durable crossings over Barton Springs. In September 1924, city officials formally advanced plans to replace the deteriorated Barton Springs bridge with a permanent concrete structure. By March 1925, the City awarded the design contract to Terrell Bartlett Engineers. The bridge’s construction followed careful engineering investigation of site conditions, including subsurface testing that identified stable 1 This historic narrative was compiled, in part, with information provided by Ross Smith. Mr. Smith is a member of the Zilker Neighborhood Associa8on Execu8ve Commi?ee for 2025. He was appointed to the Transporta8on Commi?ee, which involves discussions and mo8ons related to the neighborhood's infrastructure and community projects. limestone bedrock beneath layers of clay. Contemporary reports document that the limestone foundation was drilled to test its stability and incorporated into Bartlett’s final structural plans. The bridge is physically and historically interrelated with the development of Zilker Park and surrounding cultural resources, including early limestone quarrying operations, the Butler Brick clay pit, the Vera Daniel Paleo-Indian site and later New Deal-era park improvements constructed under the Civil Works Administration (CWA) and Civilian Conservation Corps (CCC). Together, these elements represent a layered historic landscape illustrating Austin’s growth, public works development, and recreational planning. Soil surveys begin in April 1925. The engineering crew initially assumed the location for the bridge was a deep clay bed that would require deep concrete pilings. However, test borings revealed solid gray limestone of exceptional hardness beneath the clay layer. This good fortune and solid footing was incorporated into Bartlett’s final plans for the bridge.2 The discovery of the limestone bedrock not only reduced the cost to build the bridge; it shaped Bartlett’s final structural design and ensured the long-term structural stability of the project. Bartlett’s final plans for the bridge included three 75-foot open-spandrel arch spans supporting a 20-foot roadway flanked by 4-foot sidewalks (28 feet total) and adorned with 12 ornamental lights.3 The plans were approved and formally accepted by council and the construction contract was awarded to A.A. Mundt of Austin.4 Construction started in November 1925, and the bridge opened to traffic in June 1926.5 The bridge was scheduled to open to traffic on Friday, June 18,1926, but was postponed due to rain and opened the following Monday, June 21.6 The final cost of building the bridge was $28,819.05.7 By the early 1940s, the bridge had become a traffic bottleneck. Mayor Tom Miller stated the bridge needed widening or replacement at an approximate cost of $75,000.8 The project was awarded to W.S. Conner for $70,850.9 The bridge was widened to 48 feet with pedestrian walks in 1946. Architectural and Engineering Significance The Barton Springs Bridge is a three-span, open-spandrel reinforced concrete arch bridge. As originally designed, it featured three 75-foot arch spans, reinforced concrete construction, open spandrels providing visual lightness, a 20-foot roadway with pedestrian sidewalks and 12 ornamental lights along the bridge. 2 Barton Creek Built on Rock. The Aus(n American. May 12, 1925. 3 6/25/1925 The Aus(n American. 4 8/4/1925 The Aus(n American. 5 6/22/1926 The Aus(n American. 6 6/22/1926 The Aus(n American. 7 3/24/1927 The Aus(n American. 8 5/25/1941 The Aus(n American-Statesman. Council considered building a second bridge over Barton Creek in the 1940s but instead opted to widen the original bridge. 9 10/15/1945 The Aus(n American Statesman. The open-spandrel arch type represented an advancement over earlier solid-spandrel designs by reducing material mass while maintaining structural strength and aesthetic refinement. This form became widely adopted by the Texas Highway Department in subsequent decades. The Lamar Bridge (1942–43), a federally funded New Deal project listed in the National Register of Historic Places, employs the same open-spandrel format. Nomination materials for the Lamar Bridge note that the design reflects a format widely used in Texas during this period—a format developed and popularized by engineers such as Bartlett. The Barton Springs Bridge predates Lamar and represents an earlier, locally commissioned example of this structural vocabulary. The bridge’s documented limestone foundation further enhances its engineering significance. Contemporary reports confirm that subsurface borings identified exceptionally hard limestone beneath the creek bed, allowing for stable pier construction. This documented integration of geological analysis into structural design demonstrates professional engineering methodology characteristic of early twentieth-century infrastructure projects. Despite the 1946 widening, the bridge retains its essential arch form and structural system, preserving the defining characteristics of its type. Integrity The Barton Springs Bridge retains integrity as its location remains in its original site crossing Barton Creek. It continues to function within the historic park landscape of Zilker Park and retains the three-span open-spandrel arch configuration. The reinforced concrete arches and piers are extant, and the structural articulation of the arches and spandrels remain evident. The bridge continues to successfully convey its historic function as a primary civic crossing and gateway into Zilker Park. The 1946 widening represents a historic modification more than fifty years old and reflects the bridge’s ongoing role in Austin’s transportation history. Historical Associations Terrell Bartlett (1876–1954) was one of the most prominent bridge engineers practicing in Texas during the first half of the twentieth century. A founder of the Texas Section of the American Society of Civil Engineers (1913), Bartlett played a formative role in the development and dissemination of reinforced concrete bridge design in the state. Bartlett is considered by many as a pioneer and preeminent engineer of his time. Bartlett worked across Texas. Projects include Medina River (Pleasanton Road) Bridge, San Antonio (1910), Comal River Bridge, New Braunfels (1922) and the Galveston Causeway (1940). The Comal River Bridge has been identified in preservation documentation as a design precedent for the Barton Springs Bridge. The Barton Springs structure therefore represents part of an identifiable body of work that contributed to the standardization and widespread adoption of open-spandrel concrete arch bridges across Texas. Bartlett’s professional relationship with Austin predated this commission. In 1908 he submitted bridge plans for the Congress Avenue Bridge, and in 1916 he was retained by the City to evaluate structural issues at the Austin Dam. His selection in 1925 to design the Barton Springs Bridge reflects both his established reputation and the City’s reliance on recognized engineering expertise for major infrastructure projects. In 1924, City of Austin Finance Commissioner Haynes called for a concrete bridge to replace an “antiquated and dangerous” wood and iron structure.10 The contract was awarded to Terrell Bartlett Engineering Co. of San Antonio.11 The city budgeted $25,000 for the project.12 The Barton Springs bridge embodies the distinctive characteristics of Bartlett’s work and of early twentieth-century reinforced concrete bridge engineering in Texas. Bartlett’s open- spandrel format was developed and popularized by Bartlett was widely used in Texas. Conclusion The Barton Springs Bridge is significant for its association with Austin’s early twentieth-century infrastructure development and for its embodiment of the open-spandrel reinforced concrete arch form as designed by one of Texas’s leading bridge engineers. The bridge represents a major civic investment of the 1920s and an early example of a bridge type later institutionalized statewide. The documented work of Terrell Bartlett retains sufficient integrity to convey its historic and engineering significance and continues to contribute to the historic landscape of Zilker Park. For these reasons, the Barton Springs Bridge meets the criteria for historic designation at the local level and merits preservation as a significant component of Austin’s architectural and engineering heritage. 10 9/24/1924 The Aus(n American. 11 3/8/1925 The Aus(n American. 12 3/13/1925 The Aus(n American. Barton Springs Bridge Zilker Park Historic District Austin, Travis County, Texas Completed 1926 (Widened 1946) Pica Co2224 Austin History Center Barton Springs Bridge Zilker Park Historic District Barton Springs Bridge Zilker Park Historic District The Lamar Bridge (1942–43), a federally funded New Deal project listed in the National Register of Historic Places, employs the same open-spandrel format. Nomination materials for the Lamar Bridge note that the design reflects a format widely used in Texas during this period—a format developed and popularized by engineers such as Bartlett. The Barton Creek Bridge predates Lamar and represents an earlier, locally commissioned example of this structural vocabulary. Historicbridges.org Nathan Holth, photographer July 31, 2019 The Austin American Tuesday, June 22, 1926 The Austin American Statesman Friday, January 18, 1946 The Austin American Statesman Wednesday, November 14, 1946