US Bridges

SR 123 over Summit Crk

Good

Lewis County, Washington · 0.6 N JCT US 12 · Structure no. 0013113A0000000

Built
1986
39 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
165 ft
1 main span
Daily traffic
1,116
2023 count
Owner
State
State Highway Agency

About this bridge

SR 123 over Summit Crk is a steel stringer/multi-beam or girder carrying SR 123 over Summit Crk in Lewis County, Washington. It was built in 1986, so it is 39 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 1,116 vehicles a day, roughly 5% of them trucks, projected to reach 1,495 by 2039. The structure is 165 ft (50.3 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSR 123
CrossesSummit Crk
Location0.6 N JCT US 12
RouteState Highway 123
Coordinates46.69301, -121.57739
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
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 rating99 US tons
Inventory rating99 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length165 ft (50.3 m)
Longest span160 ft (48.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,116 (2023)
Projected traffic1,495 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

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$2.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 123 over Summit Crk built?

It was built in 1986, making it 39 years old in 2025.

What condition is SR 123 over Summit Crk 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 2024.

How much traffic does SR 123 over Summit Crk carry?

About 1,116 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 123 over Summit Crk?

The structure is 165 ft (50.3 m) long with a longest span of 160 ft (48.8 m) and a deck 31 ft wide.

Who owns SR 123 over Summit Crk?

It is owned by the State Highway Agency.