US Bridges

Road over Humbug CR

Fair

Marion County, Oregon · 4.8 M NE JCT HWY 22-FS 46 · Structure no. 061804000001690

Built
1956
69 years old
Condition
Fair
inspected June 2024
Type
Frame
Concrete Continuous
Length
105 ft
3 main spans
Daily traffic
125
2006 count
Owner
Federal
U.S. Forest Service

About this bridge

Road over Humbug CR is a concrete continuous frame carrying Road over Humbug CR in Marion County, Oregon. It was built in 1956, so it is 69 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 125 vehicles a day, roughly 20% of them trucks, projected to reach 187 by 2045. The structure is 105 ft (32 m) long and 31 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

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CarriesRoad
CrossesHumbug CR
Location4.8 M NE JCT HWY 22-FS 46
RouteFederal Lands Road 46000
CountyMarion County
StateOregon
Coordinates44.77201, -122.0755
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 inspectionJune 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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating41.9 US tons
Inventory rating29.3 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length105 ft (32 m)
Longest span70 ft (21.3 m)
Deck width31 ft (9.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2006)
Projected traffic187 by 2045
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road over Humbug CR built?

It was built in 1956, making it 69 years old in 2025.

What condition is Road over Humbug CR 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 June 2024.

How much traffic does Road over Humbug CR carry?

About 125 vehicles per day (2006 count), of which roughly 20% are trucks.

How long is Road over Humbug CR?

The structure is 105 ft (32 m) long with a longest span of 70 ft (21.3 m) and a deck 31 ft wide.

Who owns Road over Humbug CR?

It is owned by the U.S. Forest Service.