Big Thompson River Bridge II, US 34 at milepost 66.22, Estes Park, CO
Big Thompson River Bridge III, US 34 at milepost 85.15, Loveland, CO
Big Thompson River Bridge IV, US 34 at milepost 86.04, Loveland, CO
All four were camelbackpony truss bridges that were designed by the Colorado Department of Highways and fabricated by Midwest Steel & Iron Works. Bridges III and IV were put together by Lawrence Construction Company in 1933, and bridges I and II were put together by contractor M.E. Carlson four years later.
The bridges were deemed significant for representing transportation and for their preserved structure.[1] Bridges I and II were removed from the National Register on November 29, 2010. Delistings from the NRHP usually occur when a listed building or other structure is demolished or if its historic integrity is otherwise severely compromised. Bridges III and IV have been substantially renovated in place so far that their camelback truss structures are entirely gone, but they currently remain on the Register.
The four bridges were identified as conforming to terms defined for historic bridge notability as defined in a 2000 study.[2]
The Big Thompson River Bridge III on US 34 at milepost 85.15 in Loveland, Colorado is a historic bridge built in 1933. It was a Camelbackpony truss bridge that was designed by the Colorado Department of Highways, fabricated by Midwest Steel & Iron Works and put up by contractor Lawrence Construction Company in 1933. The structure had length 134 feet (41 m) with main span length of 100 ft (30 m). Its superstructure was steel, rigid-connected camelback pony truss and its substructure included concrete abutments, wingwalls and piers. It had a concrete deck with asphalt overlay. The site was modified c.1980 by addition of flex-beam guardrails at approaches.[1]
The bridge was deemed worthy of historic designation largely for its engineering; like the others, it was a rigid-connected camelback pony truss bridge built of steel, and the four bridges represented the state's only surviving cluster of such bridges.[1]
It has been substantially replaced by a non-truss bridge, though the National Register listing has not yet been revoked.
It has been termed a "lost bridge" because the original structure was mostly replaced, as documented in a 2005 photo which showed trusses still in place, but the span supported by a concrete pillar construction which would not have been part of the original bridge.[6]
^ abcdOffice of Archaeology and Historic Preservation, and Clay Fraser (May 21, 2002). "National Register of Historic Places Registration: Big Thompson River Bridge III". National Park Service. and accompanying two photos from 1999
^Clayton B. Fraser (March 30, 2000). "National Register of Historic Places Multiple Property Documentation: Highway Bridges in Colorado".
^Office of Archaeology and Historic Preservation, and Clay Fraser (May 21, 2002). "National Register of Historic Places Registration: Big Thompson River Bridge I". National Park Service. and accompanying two photos from 1999
^Office of Archaeology and Historic Preservation, and Clay Fraser (May 21, 2002). "National Register of Historic Places Registration: Big Thompson River Bridge II". National Park Service. and accompanying three photos from 1999
^Office of Archaeology and Historic Preservation, and Clay Fraser (May 21, 2002). "National Register of Historic Places Registration: Big Thompson River Bridge IV". National Park Service. and accompanying two photos from 1999
April 13, 2024
thompson, river, bridges, four, historic, bridges, thompson, river, larimer, county, colorado, survived, flood, 1976, since, have, lost, most, their, historic, integrity, they, were, built, 1933, 1937, four, were, listed, national, register, historic, places, . Four historic bridges on the Big Thompson River in Larimer County Colorado survived its flood of 1976 but since have lost most of their historic integrity They were built in 1933 and 1937 All four were listed on the National Register of Historic Places in 2002 and two were delisted in 2010 The four bridges Map all coordinates using OpenStreetMap Download coordinates as KML GPX all coordinates GPX primary coordinates GPX secondary coordinates Big Thompson River Bridge I US 34 at milepost 65 53 Estes Park CO Big Thompson River Bridge II US 34 at milepost 66 22 Estes Park CO Big Thompson River Bridge III US 34 at milepost 85 15 Loveland CO Big Thompson River Bridge IV US 34 at milepost 86 04 Loveland COAll four were camelback pony truss bridges that were designed by the Colorado Department of Highways and fabricated by Midwest Steel amp Iron Works Bridges III and IV were put together by Lawrence Construction Company in 1933 and bridges I and II were put together by contractor M E Carlson four years later The bridges were deemed significant for representing transportation and for their preserved structure 1 Bridges I and II were removed from the National Register on November 29 2010 Delistings from the NRHP usually occur when a listed building or other structure is demolished or if its historic integrity is otherwise severely compromised Bridges III and IV have been substantially renovated in place so far that their camelback truss structures are entirely gone but they currently remain on the Register The four bridges were identified as conforming to terms defined for historic bridge notability as defined in a 2000 study 2 Contents 1 Bridge I 2 Bridge II 3 Bridge III 4 Bridge IV 5 ReferencesBridge I editBig Thompson River Bridge IBig Thompson River Bridge IIFormerly listed on the U S National Register of Historic PlacesNearest cityEstes Park ColoradoArealess than one acreBuilt1937 87 years ago 1937 Architectural styleCamelback pony trussMPSHighway Bridges in Colorado MPSNRHP reference No 02001144 02001141 3 Significant datesAdded to NRHPOctober 15 2002Removed from NRHPNovember 29 2010The bridge near Estes Park had pedestrian sidewalks cantilevered from the outside 4 40 22 49 N 105 28 19 W 40 38028 N 105 47194 W 40 38028 105 47194 Big Thompson River Bridge I Bridge II editThis bridge was structurally the same as its predecessor bridge 5 40 23 22 N 105 27 49 W 40 38944 N 105 46361 W 40 38944 105 46361 Big Thompson River Bridge II Bridge III edit nbsp September 2012 photo of modern replacement bridge III lacking the truss structureBig Thompson River Bridge IIIBig Thompson River Bridge IVU S National Register of Historic PlacesLocationUS 34 at milepost 85 15 III US 34 at milepost 86 04 IV Loveland ColoradoArealess than one acre III IV Built1933 91 years ago 1933 1 Architectural styleCamelback pony trussMPSHighway Bridges in Colorado MPSNRHP reference No 02001139 02001140 3 Added to NRHPOctober 15 2002The Big Thompson River Bridge III on US 34 at milepost 85 15 in Loveland Colorado is a historic bridge built in 1933 It was a Camelback pony truss bridge that was designed by the Colorado Department of Highways fabricated by Midwest Steel amp Iron Works and put up by contractor Lawrence Construction Company in 1933 The structure had length 134 feet 41 m with main span length of 100 ft 30 m Its superstructure was steel rigid connected camelback pony truss and its substructure included concrete abutments wingwalls and piers It had a concrete deck with asphalt overlay The site was modified c 1980 by addition of flex beam guardrails at approaches 1 The bridge was deemed worthy of historic designation largely for its engineering like the others it was a rigid connected camelback pony truss bridge built of steel and the four bridges represented the state s only surviving cluster of such bridges 1 It has been substantially replaced by a non truss bridge though the National Register listing has not yet been revoked It has been termed a lost bridge because the original structure was mostly replaced as documented in a 2005 photo which showed trusses still in place but the span supported by a concrete pillar construction which would not have been part of the original bridge 6 As of 2012 the pony truss structure is entirely gone as documented in its 2012 photo 40 24 54 N 105 11 42 W 40 41500 N 105 19500 W 40 41500 105 19500 Big Thompson River Bridge III Bridge IV edit nbsp Bridge at site in 2012 with truss structure entirely goneThe Big Thompson River Bridge IV was a historic camelback pony truss bridge that was built in 1933 7 A modern bridge is now located at the site the truss structure is entirely gone as documented in 2012 photo Though historic integrity is apparently gone the bridge remains listed on the National Register 40 25 7 N 105 10 47 W 40 41861 N 105 17972 W 40 41861 105 17972 Big Thompson River Bridge IV References edit a b c d Office of Archaeology and Historic Preservation and Clay Fraser May 21 2002 National Register of Historic Places Registration Big Thompson River Bridge III National Park Service and accompanying two photos from 1999 Clayton B Fraser March 30 2000 National Register of Historic Places Multiple Property Documentation Highway Bridges in Colorado a b National Register Information System National Register of Historic Places National Park Service July 9 2010 Office of Archaeology and Historic Preservation and Clay Fraser May 21 2002 National Register of Historic Places Registration Big Thompson River Bridge I National Park Service and accompanying two photos from 1999 Office of Archaeology and Historic Preservation and Clay Fraser May 21 2002 National Register of Historic Places Registration Big Thompson River Bridge II National Park Service and accompanying three photos from 1999 bridgehunter pic and description Office of Archaeology and Historic Preservation and Clay Fraser May 21 2002 National Register of Historic Places Registration Big Thompson River Bridge IV National Park Service and accompanying two photos from 1999 Retrieved from https en wikipedia org w index php title Big Thompson River bridges amp oldid 1112109869, wikipedia, wiki, book, books, library,
