US Bridges

SR 89 a over Rock Creek

Fair

Coconino County, Arizona · 17.7 MI S JCT I-40 · Structure no. 00116

Built
1934
91 years old, rebuilt 1965
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
3,730
2018 count
Owner
State
State Highway Agency

About this bridge

SR 89 a over Rock Creek is a prestressed concrete box beam or girders - multiple carrying SR 89 a over Rock Creek in Coconino County, Arizona. It was built in 1934 and reconstructed in 1965, so it is 91 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 3,730 vehicles a day, roughly 5% of them trucks, projected to reach 3,740 by 2038. The structure is 44 ft (13.4 m) long and 49 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

Location

Open in Google Maps
CarriesSR 89 a
CrossesRock Creek
Location17.7 MI S JCT I-40
RouteState Highway 89
CountyCoconino County
StateArizona
Coordinates34.9801, -111.7467
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating82 US tons
Inventory rating49.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span41 ft (12.5 m)
Deck width49 ft (14.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,730 (2018)
Projected traffic3,740 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed37.9 mi (61 km)
TollOn a free road
National Highway SystemNo

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 89 a over Rock Creek built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1965.

What condition is SR 89 a over Rock Creek 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 July 2023.

How much traffic does SR 89 a over Rock Creek carry?

About 3,730 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is SR 89 a over Rock Creek?

The structure is 44 ft (13.4 m) long with a longest span of 41 ft (12.5 m) and a deck 49 ft wide.

Who owns SR 89 a over Rock Creek?

It is owned by the State Highway Agency.