US Bridges

SW 86th Ave over Fanno Creek

Fair

Washington County, Oregon · 002 MI S Scholls Ferry RD · Structure no. 671206126500020

Built
1960
65 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
2 main spans
Daily traffic
282
2020 count
Owner
County
County Highway Agency

About this bridge

SW 86th Ave over Fanno Creek is a wood or timber stringer/multi-beam or girder carrying SW 86th Ave over Fanno Creek in Washington County, Oregon. It was built in 1960, so it is 65 years old, older than the Oregon average of 49.9 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 282 vehicles a day, roughly 5% of them trucks, projected to reach 311 by 2025. The structure is 32 ft (9.8 m) long and 19 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSW 86th Ave
CrossesFanno Creek
Location002 MI S Scholls Ferry RD
RouteCounty Highway C1408
CountyWashington County
StateOregon
Coordinates45.47121, -122.76529
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.8 US tons
Inventory rating17.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span16 ft (4.9 m)
Deck width19 ft (5.7 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic282 (2020)
Projected traffic311 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$164,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SW 86th Ave over Fanno Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is SW 86th Ave over Fanno Creek 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 August 2023.

How much traffic does SW 86th Ave over Fanno Creek carry?

About 282 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SW 86th Ave over Fanno Creek?

The structure is 32 ft (9.8 m) long with a longest span of 16 ft (4.9 m) and a deck 19 ft wide.

Who owns SW 86th Ave over Fanno Creek?

It is owned by the County Highway Agency.