US Bridges

Diamond Hill Drive over Muddy Creek

Fair

Linn County, Oregon · 017 MI E Harrisburg · Structure no. 12423A001400168

Built
1977
48 years old
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
97 ft
3 main spans
Daily traffic
1,957
2021 count
Owner
County
County Highway Agency

About this bridge

Diamond Hill Drive over Muddy Creek is a prestressed concrete slab carrying Diamond Hill Drive over Muddy Creek in Linn County, Oregon. It was built in 1977, so it is 48 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 1,957 vehicles a day, roughly 15% of them trucks, projected to reach 2,730 by 2041. The structure is 97 ft (29.6 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesDiamond Hill Drive
CrossesMuddy Creek
Location017 MI E Harrisburg
RouteCounty Highway C0014
CountyLinn County
StateOregon
Coordinates44.2853, -123.12679
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating30.8 US tons
Inventory rating23.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length97 ft (29.6 m)
Longest span32 ft (9.8 m)
Deck width36 ft (10.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,957 (2021)
Projected traffic2,730 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Diamond Hill Drive over Muddy Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is Diamond Hill Drive over 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 May 2023.

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

About 1,957 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is Diamond Hill Drive over Muddy Creek?

The structure is 97 ft (29.6 m) long with a longest span of 32 ft (9.8 m) and a deck 36 ft wide.

Who owns Diamond Hill Drive over Muddy Creek?

It is owned by the County Highway Agency.