US Bridges

I-5 (hwy 1) Conn over Santiam Overflow No. 3

Fair

Marion County, Oregon · 1/2 N of Santiam River · Structure no. 17191 001 24112

Built
1992
33 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete Continuous
Length
140 ft
3 main spans
Daily traffic
1,482
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) Conn over Santiam Overflow No. 3 is a concrete continuous slab carrying I-5 (hwy 1) Conn over Santiam Overflow No. 3 in Marion County, Oregon. It was built in 1992, so it is 33 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 1,482 vehicles a day, roughly 15% of them trucks, projected to reach 2,200 by 2030. The structure is 140 ft (42.7 m) long and 51 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesI-5 (hwy 1) Conn
CrossesSantiam Overflow No. 3
Location1/2 N of Santiam River
RouteInterstate 5
CountyMarion County
StateOregon
Coordinates44.74333, -123.0536
Functional classRural Principal Arterial - Interstate

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating29.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length140 ft (42.7 m)
Longest span56 ft (17.1 m)
Deck width51 ft (15.4 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,482 (2022)
Projected traffic2,200 by 2030
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes

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 I-5 (hwy 1) Conn over Santiam Overflow No. 3 built?

It was built in 1992, making it 33 years old in 2025.

What condition is I-5 (hwy 1) Conn over Santiam Overflow No. 3 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 February 2023.

How much traffic does I-5 (hwy 1) Conn over Santiam Overflow No. 3 carry?

About 1,482 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is I-5 (hwy 1) Conn over Santiam Overflow No. 3?

The structure is 140 ft (42.7 m) long with a longest span of 56 ft (17.1 m) and a deck 51 ft wide.

Who owns I-5 (hwy 1) Conn over Santiam Overflow No. 3?

It is owned by the State Highway Agency.