US Bridges

Fern Flat Road over Panther Creek

Fair

Washington County, Oregon · 010 MI N Greener Road · Structure no. 18739 065900100

Built
2000
25 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
13
2020 count
Owner
County
County Highway Agency

About this bridge

Fern Flat Road over Panther Creek is a prestressed concrete slab carrying Fern Flat Road over Panther Creek in Washington County, Oregon. It was built in 2000, so it is 25 years old, younger 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 13 vehicles a day, roughly 1% of them trucks, projected to reach 15 by 2025. The structure is 42 ft (12.8 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesFern Flat Road
CrossesPanther Creek
Location010 MI N Greener Road
RouteCounty Highway C0659
CountyWashington County
StateOregon
Coordinates45.74436, -123.06794
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating48.9 US tons
Inventory rating37.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length42 ft (12.8 m)
Longest span42 ft (12.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13 (2020)
Projected traffic15 by 2025
Trucks1%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fern Flat Road over Panther Creek built?

It was built in 2000, making it 25 years old in 2025.

What condition is Fern Flat Road over Panther 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 Panther Creek carry?

About 13 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Fern Flat Road over Panther Creek?

The structure is 42 ft (12.8 m) long with a longest span of 42 ft (12.8 m) and a deck 24 ft wide.

Who owns Fern Flat Road over Panther Creek?

It is owned by the County Highway Agency.