US Bridges

5th ST over Mill Creek

PoorPosted for load

Walla Walla County, Washington · 5th and Mill CR · Structure no. 085348000000000

Built
1916
109 years old
Condition
Poor
inspected September 2023
Type
Tee Beam
Concrete Continuous
Length
50 ft
2 main spans
Daily traffic
1,970
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

5th ST over Mill Creek is a concrete continuous tee beam carrying 5th ST over Mill Creek in Walla Walla County, Washington. It was built in 1916, so it is 109 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 1,970 vehicles a day, roughly 10% of them trucks, projected to reach 4,375 by 2043. The structure is 50 ft (15.2 m) long and 80 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries5th ST
CrossesMill Creek
Location5th and Mill CR
RouteCity Street 1365
Coordinates46.06639, -118.34425
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating11 US tons
Inventory rating8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length50 ft (15.2 m)
Longest span25 ft (7.6 m)
Deck width80 ft (24.5 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,970 (2023)
Projected traffic4,375 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$2.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 5th ST over Mill Creek built?

It was built in 1916, making it 109 years old in 2025.

What condition is 5th ST over Mill Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does 5th ST over Mill Creek carry?

About 1,970 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 5th ST over Mill Creek?

The structure is 50 ft (15.2 m) long with a longest span of 25 ft (7.6 m) and a deck 80 ft wide.

Who owns 5th ST over Mill Creek?

It is owned by the City or Municipal Highway Agency.