US Bridges

Park ST over Mill Creek

Fair

Walla Walla County, Washington · Park at Mill CR · Structure no. 087587000000000

Built
2007
18 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
84 ft
1 main span
Daily traffic
4,169
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Park ST over Mill Creek is a prestressed concrete box beam or girders - single or spread carrying Park 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 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 4,169 vehicles a day, roughly 1% of them trucks, projected to reach 5,036 by 2043. The structure is 84 ft (25.6 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesPark ST
CrossesMill Creek
LocationPark at Mill CR
RouteCity Street 1365
Coordinates46.06828, -118.33133
Functional classUrban Local

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating106.8 US tons
Inventory rating62.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length84 ft (25.6 m)
Longest span80 ft (24.4 m)
Deck width60 ft (18.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,169 (2023)
Projected traffic5,036 by 2043
Trucks1%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Park ST over Mill Creek built?

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

What condition is Park ST 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 Park ST over Mill Creek carry?

About 4,169 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Park ST over Mill Creek?

The structure is 84 ft (25.6 m) long with a longest span of 80 ft (24.4 m) and a deck 60 ft wide.

Who owns Park ST over Mill Creek?

It is owned by the City or Municipal Highway Agency.