US Bridges

Diamond Hill Drive over I-5 (hwy 1)

Fair

Linn County, Oregon · 055 MI N Lane-Linn Line · Structure no. 08248 001 20906

Built
1959
66 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
239 ft
4 main spans
Daily traffic
323
2010 count
Owner
State
State Highway Agency

About this bridge

Diamond Hill Drive over I-5 (hwy 1) is a prestressed concrete stringer/multi-beam or girder carrying Diamond Hill Drive over I-5 (hwy 1) 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 323 vehicles a day, roughly 5% of them trucks, projected to reach 952 by 2030. The structure is 239 ft (72.8 m) long and 31 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesDiamond Hill Drive
CrossesI-5 (hwy 1)
Location055 MI N Lane-Linn Line
RouteCounty Highway 0
CountyLinn County
StateOregon
Coordinates44.28014, -123.06089
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.8 US tons
Inventory rating23.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length239 ft (72.8 m)
Longest span76 ft (23.3 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic323 (2010)
Projected traffic952 by 2030
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.9 mi (24 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Diamond Hill Drive over I-5 (hwy 1) built?

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

What condition is Diamond Hill Drive over I-5 (hwy 1) 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 December 2024.

How much traffic does Diamond Hill Drive over I-5 (hwy 1) carry?

About 323 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is Diamond Hill Drive over I-5 (hwy 1)?

The structure is 239 ft (72.8 m) long with a longest span of 76 ft (23.3 m) and a deck 31 ft wide.

Who owns Diamond Hill Drive over I-5 (hwy 1)?

It is owned by the State Highway Agency.