US Bridges

Mclane Delphi Road over Mclane Creek

Good

Thurston County, Washington · 50 Yd S of Mckenz RD Intr · Structure no. 085973000000000

Built
1992
33 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
2,686
2020 count
Owner
County
County Highway Agency

About this bridge

Mclane Delphi Road over Mclane Creek is a prestressed concrete stringer/multi-beam or girder carrying Mclane Delphi Road over Mclane Creek in Thurston County, Washington. It was built in 1992, so it is 33 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 2,686 vehicles a day, roughly 15% of them trucks, projected to reach 4,153 by 2042. The structure is 62 ft (18.9 m) long and 36 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesMclane Delphi Road
CrossesMclane Creek
Location50 Yd S of Mckenz RD Intr
RouteCounty Highway 11155
Coordinates47.03097, -122.99188
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating84 US tons
Inventory rating50 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span60 ft (18.3 m)
Deck width36 ft (10.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,686 (2020)
Projected traffic4,153 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mclane Delphi Road over Mclane Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is Mclane Delphi Road over Mclane 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 2024.

How much traffic does Mclane Delphi Road over Mclane Creek carry?

About 2,686 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Mclane Delphi Road over Mclane Creek?

The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 36 ft wide.

Who owns Mclane Delphi Road over Mclane Creek?

It is owned by the County Highway Agency.