US Bridges

Williamson Vly RD over Walnut Creek

FairPosted for load

Yavapai County, Arizona · 38 MI N of Iron Spring RD · Structure no. 08741

Built
1915
110 years old
Condition
Fair
inspected June 2023
Type
Truss - Thru
Steel
Length
169 ft
1 main span
Daily traffic
140
2023 count
Owner
County
County Highway Agency

About this bridge

Williamson Vly RD over Walnut Creek is a steel truss - thru carrying Williamson Vly RD over Walnut Creek in Yavapai County, Arizona. It was built in 1915, so it is 110 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 140 vehicles a day, roughly 1% of them trucks, projected to reach 150 by 2042. The structure is 169 ft (51.5 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesWilliamson Vly RD
CrossesWalnut Creek
Location38 MI N of Iron Spring RD
RouteCounty Highway 0
CountyYavapai County
StateArizona
Coordinates34.92838, -112.81607
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32 US tons
Inventory rating20 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1 (+1 approach)
Design loadUnknown
Structure length169 ft (51.5 m)
Longest span139 ft (42.4 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic140 (2023)
Projected traffic150 by 2042
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Williamson Vly RD over Walnut Creek built?

It was built in 1915, making it 110 years old in 2025.

What condition is Williamson Vly RD over Walnut 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 June 2023.

How much traffic does Williamson Vly RD over Walnut Creek carry?

About 140 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Williamson Vly RD over Walnut Creek?

The structure is 169 ft (51.5 m) long with a longest span of 139 ft (42.4 m) and a deck 16 ft wide.

Who owns Williamson Vly RD over Walnut Creek?

It is owned by the County Highway Agency.