US Bridges

Main ST over Fanno Creek

Good

Washington County, Oregon · 0025 MI South Pacific HWY · Structure no. 67T001000000000

Built
1991
34 years old
Condition
Good
inspected July 2024
Type
Slab
Prestressed Concrete
Length
71 ft
1 main span
Daily traffic
12,750
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main ST over Fanno Creek is a prestressed concrete slab carrying Main ST over Fanno Creek in Washington County, Oregon. It was built in 1991, so it is 34 years old, younger than the Oregon average of 49.9 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 12,750 vehicles a day, roughly 5% of them trucks, projected to reach 13,500 by 2025. The structure is 71 ft (21.6 m) long and 73 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesMain ST
CrossesFanno Creek
Location0025 MI South Pacific HWY
RouteCity Street C0000
StateOregon
Coordinates45.42931, -122.77384
Functional classUrban Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span69 ft (21 m)
Deck width73 ft (22.3 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,750 (2020)
Projected traffic13,500 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over Fanno Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is Main ST over Fanno 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 July 2024.

How much traffic does Main ST over Fanno Creek carry?

About 12,750 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Main ST over Fanno Creek?

The structure is 71 ft (21.6 m) long with a longest span of 69 ft (21 m) and a deck 73 ft wide.

Who owns Main ST over Fanno Creek?

It is owned by the City or Municipal Highway Agency.