US Bridges

Monse Bridge RD over Okanogan River

Fair

Okanogan County, Washington · 0.25 MI W. HWY97 · Structure no. 084670000000000

Built
1967
58 years old
Condition
Fair
inspected October 2024
Type
Girder and Floorbeam System
Prestressed Concrete Continuous
Length
560 ft
5 main spans
Daily traffic
781
2023 count
Owner
County
County Highway Agency

About this bridge

Monse Bridge RD over Okanogan River is a prestressed concrete continuous girder and floorbeam system carrying Monse Bridge RD over Okanogan River in Okanogan County, Washington. It was built in 1967, so it is 58 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 781 vehicles a day, roughly 18% of them trucks, projected to reach 900 by 2043. The structure is 560 ft (170.7 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesMonse Bridge RD
CrossesOkanogan River
Location0.25 MI W. HWY97
RouteCounty Highway 18360
CountyOkanogan County
StateWashington
Coordinates48.14024, -119.6734
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating64.3 US tons
Inventory rating36.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 15
Structure length560 ft (170.7 m)
Longest span114 ft (34.7 m)
Deck width32 ft (9.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic781 (2023)
Projected traffic900 by 2043
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$20.6 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Monse Bridge RD over Okanogan River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Monse Bridge RD over Okanogan River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does Monse Bridge RD over Okanogan River carry?

About 781 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is Monse Bridge RD over Okanogan River?

The structure is 560 ft (170.7 m) long with a longest span of 114 ft (34.7 m) and a deck 32 ft wide.

Who owns Monse Bridge RD over Okanogan River?

It is owned by the County Highway Agency.