US Bridges

FAS Route A240 over Twisp River

Poor

Okanogan County, Washington · .SESES12T33NR21E · Structure no. 081404000000000

Built
1949
76 years old
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
108 ft
1 main span
Daily traffic
770
2022 count
Owner
County
County Highway Agency

About this bridge

FAS Route A240 over Twisp River is a steel stringer/multi-beam or girder carrying FAS Route A240 over Twisp River in Okanogan County, Washington. It was built in 1949, so it is 76 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 3 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 770 vehicles a day, roughly 8% of them trucks, projected to reach 800 by 2040. The structure is 108 ft (32.9 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFAS Route A240
CrossesTwisp River
Location.SESES12T33NR21E
RouteCounty Highway 91140
Coordinates48.36972, -120.14806
Functional classRural Major Collector

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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating39.2 US tons
Inventory rating30.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length108 ft (32.9 m)
Longest span80 ft (24.4 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic770 (2022)
Projected traffic800 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAS Route A240 over Twisp River built?

It was built in 1949, making it 76 years old in 2025.

What condition is FAS Route A240 over Twisp River 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 September 2023.

How much traffic does FAS Route A240 over Twisp River carry?

About 770 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is FAS Route A240 over Twisp River?

The structure is 108 ft (32.9 m) long with a longest span of 80 ft (24.4 m) and a deck 31 ft wide.

Who owns FAS Route A240 over Twisp River?

It is owned by the County Highway Agency.