US Bridges

Fern Flat Road over East Fork Dairy Creek

FairPosted for load

Washington County, Oregon · 013 MI N Greener Road · Structure no. 671371065900130

Built
1975
50 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
31 ft
1 main span
Daily traffic
28
2020 count
Owner
County
County Highway Agency

About this bridge

Fern Flat Road over East Fork Dairy Creek is a wood or timber stringer/multi-beam or girder carrying Fern Flat Road over East Fork Dairy Creek in Washington County, Oregon. It was built in 1975, so it is 50 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 28 vehicles a day, projected to reach 31 by 2025. The structure is 31 ft (9.4 m) long and 17 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesFern Flat Road
CrossesEast Fork Dairy Creek
Location013 MI N Greener Road
RouteCounty Highway C0241
CountyWashington County
StateOregon
Coordinates45.7487, -123.0722
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating22.2 US tons
Inventory rating17.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28 (2020)
Projected traffic31 by 2025
Trucks0%
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$159,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Fern Flat Road over East Fork Dairy Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Fern Flat Road over East Fork Dairy 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 July 2024.

How much traffic does Fern Flat Road over East Fork Dairy Creek carry?

About 28 vehicles per day (2020 count).

How long is Fern Flat Road over East Fork Dairy Creek?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 17 ft wide.

Who owns Fern Flat Road over East Fork Dairy Creek?

It is owned by the County Highway Agency.