US Bridges

Marsh Station RD over LA Cienega Wash

FairPosted for load

Pima County, Arizona · 0.4 MI N Benson HWY · Structure no. 08299

Built
1920
105 years old, rebuilt 1950
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
65 ft
2 main spans
Daily traffic
627
2022 count
Owner
County
County Highway Agency

About this bridge

Marsh Station RD over LA Cienega Wash is a steel continuous stringer/multi-beam or girder carrying Marsh Station RD over LA Cienega Wash in Pima County, Arizona. It was built in 1920 and reconstructed in 1950, so it is 105 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 627 vehicles a day, roughly 75% of them trucks, projected to reach 637 by 2042. The structure is 65 ft (19.8 m) long and 26 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesMarsh Station RD
CrossesLA Cienega Wash
Location0.4 MI N Benson HWY
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates31.9897, -110.5655
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37 US tons
Inventory rating22 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length65 ft (19.8 m)
Longest span32 ft (9.8 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic627 (2022)
Projected traffic637 by 2042
Trucks75%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Marsh Station RD over LA Cienega Wash built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1950.

What condition is Marsh Station RD over LA Cienega Wash in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does Marsh Station RD over LA Cienega Wash carry?

About 627 vehicles per day (2022 count), of which roughly 75% are trucks.

How long is Marsh Station RD over LA Cienega Wash?

The structure is 65 ft (19.8 m) long with a longest span of 32 ft (9.8 m) and a deck 26 ft wide.

Who owns Marsh Station RD over LA Cienega Wash?

It is owned by the County Highway Agency.