Cape Creek Bridge is an

arch bridge An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side. A viaduct ...

that spans

Cape Creek Cape Creek is a stream that enters the Pacific Ocean along the coast of Lane County in the U.S. state of Oregon. Beginning near Herman Peak in the Central Oregon Coast Range, it flows generally west through the Siuslaw National Forest to the ocea ...

Lane County, Oregon Lane County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 382,971, making it the fourth-most populous county in Oregon. The county seat is Eugene. It is named in honor of Joseph Lane, Orego ...

, United States. The bridge carries

U.S. Route 101 U.S. Route 101, or U.S. Highway 101 (US 101), is a north–south United States Numbered Highway that runs through the states of California, Oregon, and Washington, on the West Coast of the United States. It is also known as (The Royal Roa ...

. Opened in 1932, it was designed by noted bridge engineer

Conde McCullough Conde Balcom McCullough (May 30, 1887 – May 6, 1946) was an American civil 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 Tr ...

and built of reinforced concrete by John K. Holt. The total length of the bridge is , with a main span of . The bridge resembles a

Roman aqueduct The Romans constructed aqueducts throughout their Republic and later Empire, to bring water from outside sources into cities and towns. Aqueduct water supplied public baths, latrines, fountains, and private households; it also supported mining o ...

, with a single

parabolic arch A parabolic arch is an arch in the shape of a parabola.Article about parabolic arch by The Free DictionaryParabolic arch , Article about parabolic arch by The Free Dictionary accessdate: March 2, 2017 In structures, their curve represents an effi ...

that spans half its length. It was listed as Cape Creek Bridge No. 01113 on the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic v ...

in 2005, as part of the C. B. McCullough Major Oregon Coast Highway Bridges MPS (

Multiple Property Submission The National Register of Historic Places (NRHP) is the United States federal government's official United States National Register of Historic Places listings, list of Historic districts in the United States, districts, sites, buildings, struc ...

Corrosion protection

The Cape Creek Bridge has been impressed-current cathodically protected (ICCP) from

corrosion Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials (usually a metal) by chemical or electrochemical reaction with their environment. Corrosion engine ...

since 1991.

Rebar Rebar (short for reinforcing bar), known when massed as reinforcing steel or reinforcement steel, is a steel bar used as a Tension (physics), tension device in reinforced concrete and reinforced masonry structures to strengthen and aid the concr ...

in concrete is highly susceptible to corrosion by

chloride The chloride ion is the anion (negatively charged ion) Cl−. It is formed when the element chlorine (a halogen) gains an electron or when a compound such as hydrogen chloride is dissolved in water or other polar solvents. Chloride salts ...

ions from

seawater Seawater, or salt water, is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% (35 g/L, 35 ppt, 600 mM). This means that every kilogram (roughly one liter by volume) of seawater has appro ...

and de-icing salts. Contractors to the

Oregon Department of Transportation The Oregon Department of Transportation (ODOT) is a department of the state government of the U.S. state of Oregon responsible for systems of transportation. It was first established in 1969. It had been preceded by the Oregon State Highway Depar ...

have plasma-sprayed of

zinc Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodi ...

onto the exposed concrete to provide a sacrificial anode that corrodes in lieu of the steel rebar.

References

External links

* Open-spandrel deck arch bridges in the United States Oregon Coast Road bridges on the National Register of Historic Places in Oregon Bridges completed in 1932 U.S. Route 101 National Register of Historic Places in Lane County, Oregon Bridges in Lane County, Oregon Concrete bridges in Oregon Historic American Engineering Record in Oregon Bridges by Conde McCullough Bridges of the United States Numbered Highway System 1932 establishments in Oregon {{Oregon-NRHP-stub

Corrosion protection

See also

References

External links