US Bridges

Division ST over Mill Creek

Good

Walla Walla County, Washington · Division at Mill CR · Structure no. 087588000000000

Built
2007
18 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
4,170
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Division ST over Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying Division ST over Mill Creek in Walla Walla County, Washington. It was built in 2007, so it is 18 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,170 vehicles a day, projected to reach 5,035 by 2043. The structure is 52 ft (15.8 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesDivision ST
CrossesMill Creek
LocationDivision at Mill CR
RouteCity Street 1365
CountyWalla Walla County
StateWashington
Coordinates46.06928, -118.31994
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length52 ft (15.8 m)
Longest span51 ft (15.5 m)
Deck width36 ft (11 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,170 (2023)
Projected traffic5,035 by 2043
Trucks0%
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 Division ST over Mill Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is Division ST over Mill Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Division ST over Mill Creek carry?

About 4,170 vehicles per day (2023 count).

How long is Division ST over Mill Creek?

The structure is 52 ft (15.8 m) long with a longest span of 51 ft (15.5 m) and a deck 36 ft wide.

Who owns Division ST over Mill Creek?

It is owned by the City or Municipal Highway Agency.