US Bridges

SR 31 over Sullivan Creek

Poor

Pend Oreille County, Washington · 14.8 N JCT SR 20 · Structure no. 0001259A0000000

Built
1927
98 years old
Condition
Poor
inspected August 2024
Type
Tee Beam
Concrete
Length
180 ft
3 main spans
Daily traffic
949
2023 count
Owner
State
State Highway Agency

About this bridge

SR 31 over Sullivan Creek is a concrete tee beam carrying SR 31 over Sullivan Creek in Pend Oreille County, Washington. It was built in 1927, so it is 98 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 949 vehicles a day, roughly 12% of them trucks, projected to reach 1,168 by 2039. The structure is 180 ft (54.9 m) long and 25 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 31
CrossesSullivan Creek
Location14.8 N JCT SR 20
RouteState Highway 31
CountyPend Oreille County
StateWashington
Coordinates48.86031, -117.36362
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating42.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length180 ft (54.9 m)
Longest span60 ft (18.3 m)
Deck width25 ft (7.7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic949 (2023)
Projected traffic1,168 by 2039
Trucks12%
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$2.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 31 over Sullivan Creek built?

It was built in 1927, making it 98 years old in 2025.

What condition is SR 31 over Sullivan Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does SR 31 over Sullivan Creek carry?

About 949 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is SR 31 over Sullivan Creek?

The structure is 180 ft (54.9 m) long with a longest span of 60 ft (18.3 m) and a deck 25 ft wide.

Who owns SR 31 over Sullivan Creek?

It is owned by the State Highway Agency.