US Bridges

US 101 over Eagle CR

Good

Mason County, Washington · 10.1 S Jefferson CO · Structure no. 0003764A0000000

Built
1950
75 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
82 ft
4 main spans
Daily traffic
3,065
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Eagle CR is a concrete continuous slab carrying US 101 over Eagle CR in Mason County, Washington. It was built in 1950, so it is 75 years old, older 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 3,065 vehicles a day, roughly 12% of them trucks, projected to reach 4,039 by 2039. The structure is 82 ft (25 m) long and 40 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

Location

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CarriesUS 101
CrossesEagle CR
Location10.1 S Jefferson CO
RouteU.S. Route 101
CountyMason County
StateWashington
Coordinates47.48506, -123.07797
Functional classRural Principal Arterial - Other

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating29.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length82 ft (25 m)
Longest span22 ft (6.7 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,065 (2023)
Projected traffic4,039 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Eagle CR built?

It was built in 1950, making it 75 years old in 2025.

What condition is US 101 over Eagle CR 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 July 2023.

How much traffic does US 101 over Eagle CR carry?

About 3,065 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 101 over Eagle CR?

The structure is 82 ft (25 m) long with a longest span of 22 ft (6.7 m) and a deck 40 ft wide.

Who owns US 101 over Eagle CR?

It is owned by the State Highway Agency.