Red Bridge (Monroe, Iowa)

{{Use mdy dates|date=March 2025}}

{{Use American English|date=January 2025}}

{{Infobox NRHP

| name = Red Bridge

| nrhp_type =

| image = Red Bridge, Jasper County, Iowa.jpg

| caption =

| location = County Road S74 over the South Skunk River

| nearest_city = Monroe, Iowa

| coordinates = {{coord|41|32|28|N|93|01|15|W|display=inline,title}}

| locmapin = Iowa#USA

| built = 1892

| builder = H.S. Efnor

| architect =

| architecture = Warren through truss
Warren pony truss

| added = May 15, 1998

| area = less than one acre

| mpsub = {{NRHP url|id=64500160|title=Highway Bridges of Iowa MPS}}

| refnum = 98000521{{NRISref|2009a}}

}}

The Red Bridge is located just northeast of Monroe, Iowa, United States. The {{convert|212|ft|m|adj=on}} span carried traffic on County Road S74 over the South Skunk River. This is one of the few Warren truss bridges built in Iowa in the 19th century.{{cite web|url={{NRHP url|id=98000521}}|title=Red Bridge|publisher=National Park Service|access-date=2016-04-11|author=Clayton B. Fraser}} Local bridge contractor H.S. Efnor built the main span for $3,515.34 in 1892. It received considerable damage in a 1947 flood, and the county replaced one of its steel cylinder piers with a concrete pier, and added the pony truss approach span on the north side. It has subsequently been closed to traffic.{{cite web|url=http://www.iowadot.gov/historicbridges/detail.asp?id=109|title=Red Bridge|publisher=Iowa Department of Transportation|access-date=2016-04-11|author=}} The bridge was listed on the National Register of Historic Places in 1998.