US Bridges

US 70 over Slick Rock Wash

Fair

Graham County, Arizona · 16.2 MI E JCT SR 191 · Structure no. 00219

Built
1938
87 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
76 ft
3 main spans
Daily traffic
1,063
2022 count
Owner
State
State Highway Agency

About this bridge

US 70 over Slick Rock Wash is a concrete continuous slab carrying US 70 over Slick Rock Wash in Graham County, Arizona. It was built in 1938, so it is 87 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 1,063 vehicles a day, roughly 10% of them trucks, projected to reach 1,073 by 2042. The structure is 76 ft (23.2 m) long and 37 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesUS 70
CrossesSlick Rock Wash
Location16.2 MI E JCT SR 191
RouteU.S. Route 70
CountyGraham County
StateArizona
Coordinates32.7781, -109.2952
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length76 ft (23.2 m)
Longest span25 ft (7.6 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,063 (2022)
Projected traffic1,073 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 US 70 over Slick Rock Wash built?

It was built in 1938, making it 87 years old in 2025.

What condition is US 70 over Slick Rock 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 August 2023.

How much traffic does US 70 over Slick Rock Wash carry?

About 1,063 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is US 70 over Slick Rock Wash?

The structure is 76 ft (23.2 m) long with a longest span of 25 ft (7.6 m) and a deck 37 ft wide.

Who owns US 70 over Slick Rock Wash?

It is owned by the State Highway Agency.