US Bridges

Roberts Road over Calapooia River

Fair

Linn County, Oregon · 011 MI S CR 13 · Structure no. 12556A042000114

Built
1997
28 years old
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
72 ft
2 main spans
Daily traffic
124
2021 count
Owner
County
County Highway Agency

About this bridge

Roberts Road over Calapooia River is a prestressed concrete slab carrying Roberts Road over Calapooia River in Linn County, Oregon. It was built in 1997, so it is 28 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 124 vehicles a day, projected to reach 175 by 2041. The structure is 72 ft (21.9 m) long and 32 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesRoberts Road
CrossesCalapooia River
Location011 MI S CR 13
RouteCounty Highway C0420
CountyLinn County
StateOregon
Coordinates44.44634, -123.0765
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 15
Structure length72 ft (21.9 m)
Longest span36 ft (11 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic124 (2021)
Projected traffic175 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 Roberts Road over Calapooia River built?

It was built in 1997, making it 28 years old in 2025.

What condition is Roberts Road over Calapooia River 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 Roberts Road over Calapooia River carry?

About 124 vehicles per day (2021 count).

How long is Roberts Road over Calapooia River?

The structure is 72 ft (21.9 m) long with a longest span of 36 ft (11 m) and a deck 32 ft wide.

Who owns Roberts Road over Calapooia River?

It is owned by the County Highway Agency.