US Bridges

Morrison RD over Little Rock Creek

Fair

Linn County, Oregon · MP 0.28 · Structure no. 23964 000 00028

Built
2019
6 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
90 ft
1 main span
Daily traffic
309
2021 count
Owner
County
County Highway Agency

About this bridge

Morrison RD over Little Rock Creek is a prestressed concrete box beam or girders - multiple carrying Morrison RD over Little Rock Creek in Linn County, Oregon. It was built in 2019, so it is 6 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 309 vehicles a day, roughly 8% of them trucks, projected to reach 515 by 2041. The structure is 90 ft (27.4 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMorrison RD
CrossesLittle Rock Creek
LocationMP 0.28
RouteCounty Highway 0
CountyLinn County
StateOregon
Coordinates44.74391, -122.39424
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating27.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length90 ft (27.4 m)
Longest span89 ft (27.1 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic309 (2021)
Projected traffic515 by 2041
Trucks8%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$256,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Morrison RD over Little Rock Creek built?

It was built in 2019, making it 6 years old in 2025.

What condition is Morrison RD over Little Rock 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 July 2023.

How much traffic does Morrison RD over Little Rock Creek carry?

About 309 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Morrison RD over Little Rock Creek?

The structure is 90 ft (27.4 m) long with a longest span of 89 ft (27.1 m) and a deck 16 ft wide.

Who owns Morrison RD over Little Rock Creek?

It is owned by the County Highway Agency.