US Bridges

Diamond Hill Drive over Little Muddy Creek

Fair

Linn County, Oregon · 003 MI E Diamond Hill Int · Structure no. 08249 001F20906

Built
1959
66 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
170 ft
5 main spans
Daily traffic
1,558
2022 count
Owner
State
State Highway Agency

About this bridge

Diamond Hill Drive over Little Muddy Creek is a concrete continuous tee beam carrying Diamond Hill Drive over Little Muddy Creek in Linn County, Oregon. It was built in 1959, so it is 66 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 1,558 vehicles a day, roughly 25% of them trucks, projected to reach 2,200 by 2030. The structure is 170 ft (51.8 m) long and 31 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesDiamond Hill Drive
CrossesLittle Muddy Creek
Location003 MI E Diamond Hill Int
RouteState Highway 5
CountyLinn County
StateOregon
Coordinates44.28015, -123.05908
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span36 ft (11 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,558 (2022)
Projected traffic2,200 by 2030
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$871,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Diamond Hill Drive over Little Muddy Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Diamond Hill Drive over Little Muddy 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 March 2023.

How much traffic does Diamond Hill Drive over Little Muddy Creek carry?

About 1,558 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is Diamond Hill Drive over Little Muddy Creek?

The structure is 170 ft (51.8 m) long with a longest span of 36 ft (11 m) and a deck 31 ft wide.

Who owns Diamond Hill Drive over Little Muddy Creek?

It is owned by the State Highway Agency.