Hennepin Avenue Bridge (1888)
Description
The bridge, a century-old at its demolition, consisted of two spans steel arch spans. The bridge had special historic significance to engineering as the two spans were built by different companies in different styles. While both spans are hinged arch bridges, the northern span was built with a two-hinge design, and the later southern span was built as a three-hinge design after the northern span was found to "jiggle" under the load of traffic. This dual-design nature of the bridge later contributed to it being considered historic. The corrugated steel deck gave a tenor hum as vehicles drove across.
History
Background
The population of Minneapolis greatly expanded from 47,000 in 1880 to 185,000 in 1890. By 1884, it had become clear that the 1876 suspension bridge was no longer sufficient. Hennepin County authorized funding for an 80-foot-wide stone arch bridge. However, there was opposition to this proposal; by milling companies because of the three piers that would be required and a possible reduction in power output from the river, and also from others who wanted to preserve the "beautiful" previous bridge. Despite the opposition, construction began in December 1885 but an injunction was obtained by a milling company to halt work in January 1886. A reevaluation by engineers recommended a steel arch bridge with a single pier. As an added benefit, this structure would also be cheaper. The dual steel arch bridge was designed by Andrew Rinker, the Minneapolis city engineer, and Frederick William Cappelen.
Construction
The bridge's northern span was built by the Keystone Bridge Company of Pittsburgh, and the $187,613 ($6.36 million in 2023) span became open for travel on June 3, 1888. For some time, the new steel arch bridge and the old suspension bridge stood side-by-side. The new steel arch span and the previous suspension bridge stood side-by-side until it became clear the suspension bridge was no longer structurally sound. At that time, bids were accepted for a second, southern span. The second span was built by Wrought Iron Bridge Company of Canton, Ohio, and was substantially completed by January 1891. The total cost of the bridges was $266,365 ($9.03 million in 2023). Each span consisted of two 280-ft arches. The roadway was 56 feet wide, with 12 feet for sidewalks.
Renovations
The bridge received three major renovations over the course of its life. The first was in 1897, installing buckle plates and repaving the northern half of the bridge. In 1931, the brick paving was replaced by timber overlaid with asphalt. A 1954 renovation removed the timber deck and replaced it with a open mesh steel I-beam deck, and at the same time added concrete curbing, new guard rails, and new lamp posts.
End of life
In 1971, the bridge was added to the National Register of Historic Places as a contributing property of the St. Anthony Falls Historic District.
By 1982, Hennepin County had began looking into replacing the at the time 94-year-old bridge. Without major renovations or replacement the county estimated the bridge would only last another five years. with over 20,000 vehicle crossings every day, the bridge was showing an inability to keep up with the load of modern traffic. While in good condition, the aging bridge was determined to need around $10 million ($24.6 million in 2023) in remodeling costs. However, county officials required that the bridge be able to carry six lanes of traffic with the potential to accommodate light rail lines, which scuttled plans to renovate rather than rebuild the bridge.
The year 1987 saw Congress pass the Surface Transportation and Uniform Relocation Assistance Act, which required states to inventory historic bridges and attempt to rehabilitate or relocate qualifying bridges before demolition. Following a call from a government bureaucrat informing him of the requirement, Ted Hoffman, the chief design engineer of Hennepin County, advertised the bridge as for sale in January 1988. Hoffman expressed incredulity at the concept, stating that he couldn't "imagine someone going to that expense". By July the bridge began to be gradually disassembled, one hundred years after its completion. The northern half was torn down in 1988, and the southern half in 1989 after the northern half of the new bridge opened.
See also
- Media related to Hennepin Avenue Bridge (1888) at Wikimedia Commons
- Grain Belt Beer Sign
- List of bridges documented by the Historic American Engineering Record in Minnesota
- List of crossings of the Upper Mississippi River
References
- ^ It does not appear that a sale went through. Contemporary reporting suggests mockery at the idea, both for the Hennepin bridge and others.
References
- ^ "National Register Information System – (#71000438)". National Register of Historic Places. National Park Service. March 15, 2006.
- ^ Nelson, Dan (July 19, 1982). "Critics hope to sink plans to replace Hennepin Av. bridge". Star Tribune. pp. 1C, 2C. Retrieved January 27, 2025.
- ^ Parsons, Jim (January 5, 1988). "Hey rube! You maybe wanna buy a slightly used bridge?". Star Tribune. p. 7.
- ^ Historic American Engineering Record. "STEEL ARCH BRIDGE (Hennepin Avenue Bridge)". National Park Service.
- ^ "Stone Arch Bridge Specifications". Star Tribune. September 12, 1885. p. 5. Retrieved January 27, 2025.
- ^ "The Mill Company Offers Pointed Objections to Construction". Star Tribune. January 5, 1886. p. 3. Retrieved January 27, 2025.
- ^ "A temporary injunction". Star Tribune. January 15, 1886. p. 1.
- ^ "New Deck for Bridge". The Minneapolis Star. May 18, 1954. p. 19. Retrieved January 27, 2025.
- ^ "Open deck planned for Hennepin Bridge". The Minneapolis Star. December 1, 1953. p. 10. Retrieved January 27, 2025.
- ^ Kaszuba, Mike (September 19, 1989). "It's a beauty of a bridge, with a beauty of a price". Star Tribune. pp. 1, 6A. Retrieved January 27, 2025.
- ^ Hiebert, Matt (November 15, 2002). "How Missouri's old bridges get new lives". The Springfield News-Leader. p. 69. Retrieved January 28, 2025.
- ^ Wingar, Karin (July 10, 1988). "Anson Northrup beings life on the river". Star Tribune. p. 65. Retrieved January 27, 2025.