US Bridges

US 101 over Middle Nemah River

Good

Pacific County, Washington · 5.0 N JCT SR 4 · Structure no. 0018344A0000000

Built
2014
11 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
127 ft
1 main span
Daily traffic
2,815
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Middle Nemah River is a prestressed concrete stringer/multi-beam or girder carrying US 101 over Middle Nemah River in Pacific County, Washington. It was built in 2014, so it is 11 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 2,815 vehicles a day, roughly 8% of them trucks, projected to reach 3,300 by 2039. The structure is 127 ft (38.7 m) long and 39 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUS 101
CrossesMiddle Nemah River
Location5.0 N JCT SR 4
RouteU.S. Route 101
Coordinates46.49382, -123.88798
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating47.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length127 ft (38.7 m)
Longest span122 ft (37.2 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,815 (2023)
Projected traffic3,300 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Middle Nemah River built?

It was built in 2014, making it 11 years old in 2025.

What condition is US 101 over Middle Nemah River 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 April 2024.

How much traffic does US 101 over Middle Nemah River carry?

About 2,815 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 101 over Middle Nemah River?

The structure is 127 ft (38.7 m) long with a longest span of 122 ft (37.2 m) and a deck 39 ft wide.

Who owns US 101 over Middle Nemah River?

It is owned by the State Highway Agency.