US Bridges

SR 260 over Mortensen Wash

Fair

Navajo County, Arizona · 11.8 MI W JCT US 60 · Structure no. 01641

Built
1974
51 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
219 ft
3 main spans
Daily traffic
5,217
2022 count
Owner
State
State Highway Agency

About this bridge

SR 260 over Mortensen Wash is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 260 over Mortensen Wash in Navajo County, Arizona. It was built in 1974, so it is 51 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,217 vehicles a day, roughly 16% of them trucks, projected to reach 5,227 by 2042. The structure is 219 ft (66.8 m) long and 41 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

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CarriesSR 260
CrossesMortensen Wash
Location11.8 MI W JCT US 60
RouteState Highway 260
CountyNavajo County
StateArizona
Coordinates34.3115, -110.229
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length219 ft (66.8 m)
Longest span73 ft (22.3 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,217 (2022)
Projected traffic5,227 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 260 over Mortensen Wash built?

It was built in 1974, making it 51 years old in 2025.

What condition is SR 260 over Mortensen 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 October 2024.

How much traffic does SR 260 over Mortensen Wash carry?

About 5,217 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is SR 260 over Mortensen Wash?

The structure is 219 ft (66.8 m) long with a longest span of 73 ft (22.3 m) and a deck 41 ft wide.

Who owns SR 260 over Mortensen Wash?

It is owned by the State Highway Agency.