US Bridges

SR 105 over Norris Slough

Good

Pacific County, Washington · 16.5 N JCT US 101 · Structure no. 0017984A0000000

Built
2011
14 years old
Condition
Good
inspected February 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
1,099
2023 count
Owner
State
State Highway Agency

About this bridge

SR 105 over Norris Slough is a prestressed concrete stringer/multi-beam or girder carrying SR 105 over Norris Slough in Pacific County, Washington. It was built in 2011, so it is 14 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,099 vehicles a day, roughly 12% of them trucks, projected to reach 1,302 by 2039. The structure is 87 ft (26.5 m) long and 37 ft wide. If it were closed, the detour would be 88.2 mi (142 km).

Location

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CarriesSR 105
CrossesNorris Slough
Location16.5 N JCT US 101
RouteState Highway 105
CountyPacific County
StateWashington
Coordinates46.73719, -123.98238
Functional classRural Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length87 ft (26.5 m)
Longest span83 ft (25.3 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,099 (2023)
Projected traffic1,302 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed88.2 mi (142 km)
TollOn a free road
National Highway SystemNo

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$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 105 over Norris Slough built?

It was built in 2011, making it 14 years old in 2025.

What condition is SR 105 over Norris Slough 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 February 2022.

How much traffic does SR 105 over Norris Slough carry?

About 1,099 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is SR 105 over Norris Slough?

The structure is 87 ft (26.5 m) long with a longest span of 83 ft (25.3 m) and a deck 37 ft wide.

Who owns SR 105 over Norris Slough?

It is owned by the State Highway Agency.