Road over Blowout CR

Fair

Linn County, Oregon · 11.1 M S JCT HWY 22-FS 10 · Structure no. 061804000001671

Built: 1954; 71 years old
Condition: Fair; inspected June 2024
Type: Frame; Concrete Continuous
Length: 115 ft; 3 main spans
Daily traffic: 75
Owner: Federal; U.S. Forest Service

About this bridge

Road over Blowout CR is a concrete continuous frame carrying Road over Blowout CR in Linn County, Oregon. It was built in 1954, so it is 71 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.

It carries about 75 vehicles a day, projected to reach 112 by 2045. The structure is 115 ft (35.1 m) long and 16 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

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CarriesRoad

CrossesBlowout CR

Location11.1 M S JCT HWY 22-FS 10

RouteFederal Lands Road 10000

CountyLinn County

StateOregon

Coordinates44.65299, -122.13082

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.

Component	Rating	Meaning
Deck	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	7 Good	Some minor problems.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionJune 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourCountermeasures installed to correct a previously existing problem

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating39.7 US tons

Inventory rating26.7 US tons

Structure

Structure typeFrame

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length115 ft (35.1 m)

Longest span75 ft (22.9 m)

Deck width16 ft (5 m)

Roadway width14 ft (4.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (—)

Projected traffic112 by 2045

Trucks—

Lanes on structure1

Traffic directionOne-lane bridge for two-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 Blowout CR built?

It was built in 1954, making it 71 years old in 2025.

What condition is Road over Blowout 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 Blowout CR carry?

About 75 vehicles per day (latest count).

How long is Road over Blowout CR?

The structure is 115 ft (35.1 m) long with a longest span of 75 ft (22.9 m) and a deck 16 ft wide.

Who owns Road over Blowout CR?

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