US Bridges

SR 105 over Smith Creek

Good

Pacific County, Washington · 10.1 N JCT US 101 · Structure no. 0018345A0000000

Built
2013
12 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
320 ft
3 main spans
Daily traffic
1,099
2023 count
Owner
State
State Highway Agency

About this bridge

SR 105 over Smith Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 105 over Smith Creek in Pacific County, Washington. It was built in 2013, so it is 12 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 1,099 vehicles a day, roughly 12% of them trucks, projected to reach 1,302 by 2039. The structure is 320 ft (97.5 m) long and 39 ft wide. If it were closed, the detour would be 70.8 mi (114 km).

CarriesSR 105
CrossesSmith Creek
Location10.1 N JCT US 101
RouteState Highway 105
Coordinates46.74689, -123.88433
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length320 ft (97.5 m)
Longest span110 ft (33.5 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 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 closed70.8 mi (114 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$5.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 105 over Smith Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is SR 105 over Smith 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 April 2024.

How much traffic does SR 105 over Smith Creek carry?

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

How long is SR 105 over Smith Creek?

The structure is 320 ft (97.5 m) long with a longest span of 110 ft (33.5 m) and a deck 39 ft wide.

Who owns SR 105 over Smith Creek?

It is owned by the State Highway Agency.