US Bridges

13th Ave over Mill Creek

Fair

Walla Walla County, Washington · 0.070 S Cherry ST · Structure no. 085321000000000

Built
1980
45 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
115 ft
3 main spans
Daily traffic
2,690
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

13th Ave over Mill Creek is a concrete continuous slab carrying 13th Ave over Mill Creek in Walla Walla County, Washington. It was built in 1980, so it is 45 years old, younger than the Washington average of 49.8 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 2,690 vehicles a day, roughly 10% of them trucks, projected to reach 12,000 by 2043. The structure is 115 ft (35.1 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries13th Ave
CrossesMill Creek
Location0.070 S Cherry ST
RouteCity Street 1365
CountyWalla Walla County
StateWashington
Coordinates46.06658, -118.35647
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span40 ft (12.2 m)
Deck width63 ft (19.1 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,690 (2023)
Projected traffic12,000 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 13th Ave over Mill Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is 13th Ave over Mill 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 September 2023.

How much traffic does 13th Ave over Mill Creek carry?

About 2,690 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 13th Ave over Mill Creek?

The structure is 115 ft (35.1 m) long with a longest span of 40 ft (12.2 m) and a deck 63 ft wide.

Who owns 13th Ave over Mill Creek?

It is owned by the City or Municipal Highway Agency.