The Marsh Engineering Company was a company that designed many significant bridges in the United States, including 7 that survive and are listed on the National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

. It was located in Des Moines, Iowa

Des Moines, Iowa

Des Moines is the capital and the most populous city in the US state of Iowa. It is also the county seat of Polk County. A small portion of the city extends into Warren County. It was incorporated on September 22, 1851, as Fort Des Moines which was shortened to "Des Moines" in 1857...

.

The firm's principal engineer was James Barney Marsh

James Barney Marsh

James Barney Marsh was an engineer and bridge designer born in North Lake, Wisconsin. He was a graduate of Iowa State College of Agriculture and Mechanical Arts in Ames....

 (1856–1936), an engineer and bridge designer born in North Lake, Wisconsin. He was a graduate of Iowa.

• Marsh Concrete Rainbow Arch Bridge
  Marsh Concrete Rainbow Arch Bridge
  Marsh Concrete Rainbow Arch Bridge is a reinforced concrete through arch bridge over the Little Cottonwood River in Cambria Township, Blue Earth County, Minnesota. The bridge is listed on the National Register of Historic Places...
  
  , Minnesota, is a reinforced concrete through arch bridge, built in 1911 the same year that Marsh obtained a patent for his design.

• Cotter Bridge
  Cotter Bridge
  The Cotter Bridge, also known as the R.M. Ruthven Bridge and the White River Concrete Arch Bridge, carries the business route of U.S. Route 62 across the White River west of the city of Cotter in Baxter County, Arkansas, USA. Upon completion, the bridge allowed access to a part of The Ozarks...
  
  , constructed in 1930, is the only bridge built by Marsh Engineering Company of Des Moines, Iowa in the state of Arkansas. It brings U.S. Route 62
  U.S. Route 62
  U.S. Route 62 runs from the US-Mexico border at El Paso, Texas to Niagara Falls, New York, near the United States-Canada border. It is the only east-west US Route that connects Mexico and Canada.Parts of U.S...
  
  , over the White River
  White River (Arkansas)
  The White River is a 722-mile long river that flows through the U.S. states of Arkansas and Missouri.-Course:The source of the White River is in the Boston Mountains of northwest Arkansas, in the Ozark-St. Francis National Forest southeast of Fayetteville...
  
  , and opened up a large area of the Ozarks for recreation.

• Henley Street Bridge
  Henley Street Bridge
  The Henley Street Bridge, or Henley Bridge, is a vehicle bridge that crosses the Tennessee River in Knoxville, Tennessee. Completed in 1931, the bridge is one of four vehicle bridges connecting Downtown Knoxville with South Knoxville, the other three being the Gay Street Bridge, the Buck Karnes...
  
  , in Knoxville, Tennessee, designed in 1930

The NRHP-listed bridges by the firm are the Cotter Bridge and also:

• Rainbow Arch Bridge, CO 52, Fort Morgan, Colorado
• Marsh Concrete Rainbow Arch Bridge
  Marsh Concrete Rainbow Arch Bridge
  Marsh Concrete Rainbow Arch Bridge is a reinforced concrete through arch bridge over the Little Cottonwood River in Cambria Township, Blue Earth County, Minnesota. The bridge is listed on the National Register of Historic Places...
  
  , CR 101 over Little Cottonwood River
  Little Cottonwood River
  The Little Cottonwood River is a tributary of the Minnesota River, 83 miles long, in southwestern Minnesota in the United States...
  
  , Courtland, Minnesota
• Dunkerton Bridge, Town street over Crane Creek
  Crane Creek
  Crane Creek may refer to:*Crane Creek *Crane Creek *Crane Creek...
  
  , Dunkerton, Iowa
• First Avenue Bridge, US 151 over Cedar River, Cedar Rapids, Iowa
• Mederville Bridge, County road over Volga River
  Volga River
  The Volga is the largest river in Europe in terms of length, discharge, and watershed. It flows through central Russia, and is widely viewed as the national river of Russia. Out of the twenty largest cities of Russia, eleven, including the capital Moscow, are situated in the Volga's drainage...
  
  , Mederville, Iowa
• Squaw Creek Bridge, 2 110th St. and V Ave. over Squaw Creek
  Squaw Creek
  Squaw Creek is the name of several bodies of water in North America, including:* Squaw Creek , a tributary of the Tatshenshini River* Squaw Creek , a tributary of the South Skunk River...
  
  , Ridgeport, Iowa

The Wilson River Bridge

Wilson River Bridge

Wilson River Bridge, also known as Wilson River Bridge at Tillamook or Wilson River Bridge No. 01499, is a bridge near Tillamook, Oregon, United States. The 1931 bridge was designed by Conde McCullough in the Classical Revival and Art Deco styles. It covers a span of 180 feet and brings coastal U.S...

, near Tillamook, Washington, and others like it in Washington was designed by Conde McCullough

Conde McCullough

Conde Balcom McCullough was a U.S. bridge engineer who is primarily known for designing many of Oregon's coastal bridges on U.S. Route 101. The native of South Dakota worked for the Oregon Department of Transportation from 1919 to 1935 and 1937 until 1946...

, who had been employed at Marsh Engineering Company during the 1910s.