US Bridges

Evergreen Parkway over Mud Bay Road

Fair

Thurston County, Washington · 0.2 N JCT US 101 · Structure no. 0009749B0000000

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete Continuous
Length
211 ft
3 main spans
Daily traffic
6,090
2021 count
Owner
County
County Highway Agency

About this bridge

Evergreen Parkway over Mud Bay Road is a concrete continuous tee beam carrying Evergreen Parkway over Mud Bay Road in Thurston County, Washington. It was built in 1975, so it is 50 years old, older 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 6,090 vehicles a day, roughly 10% of them trucks, projected to reach 9,415 by 2043. The structure is 211 ft (64.3 m) long and 52 ft wide.

Location

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CarriesEvergreen Parkway
CrossesMud Bay Road
Location0.2 N JCT US 101
RouteCounty Highway 11440
CountyThurston County
StateWashington
Coordinates47.0456, -122.97162
Functional classUrban Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating52 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length211 ft (64.3 m)
Longest span100 ft (30.5 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,090 (2021)
Projected traffic9,415 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Evergreen Parkway over Mud Bay Road built?

It was built in 1975, making it 50 years old in 2025.

What condition is Evergreen Parkway over Mud Bay Road 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 June 2023.

How much traffic does Evergreen Parkway over Mud Bay Road carry?

About 6,090 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Evergreen Parkway over Mud Bay Road?

The structure is 211 ft (64.3 m) long with a longest span of 100 ft (30.5 m) and a deck 52 ft wide.

Who owns Evergreen Parkway over Mud Bay Road?

It is owned by the County Highway Agency.