US Bridges

Marsh Station RD over Pantano Wash & RR

FairPosted for load

Pima County, Arizona · 6.1 MI N Benson HWY · Structure no. 08293

Built
1920
105 years old, rebuilt 1989
Condition
Fair
inspected December 2023
Type
Arch - Deck
Concrete
Length
278 ft
1 main span
Daily traffic
507
2022 count
Owner
County
County Highway Agency

About this bridge

Marsh Station RD over Pantano Wash & RR is a concrete arch - deck carrying Marsh Station RD over Pantano Wash & RR in Pima County, Arizona. It was built in 1920 and reconstructed in 1989, 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 507 vehicles a day, projected to reach 517 by 2042. The structure is 278 ft (84.7 m) long and 23 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesMarsh Station RD
CrossesPantano Wash & RR
Location6.1 MI N Benson HWY
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.0193, -110.6461
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+5 approach)
Design loadH 15
Structure length278 ft (84.7 m)
Longest span146 ft (44.5 m)
Deck width23 ft (7.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic507 (2022)
Projected traffic517 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
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 statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Marsh Station RD over Pantano Wash & RR built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1989.

What condition is Marsh Station RD over Pantano Wash & RR 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 December 2023.

How much traffic does Marsh Station RD over Pantano Wash & RR carry?

About 507 vehicles per day (2022 count).

How long is Marsh Station RD over Pantano Wash & RR?

The structure is 278 ft (84.7 m) long with a longest span of 146 ft (44.5 m) and a deck 23 ft wide.

Who owns Marsh Station RD over Pantano Wash & RR?

It is owned by the County Highway Agency.