US Bridges

N Adams Dr. over North Unit Main Canal

Good

Jefferson County, Oregon · 1.01 MI N of Fir Lane · Structure no. 21151 000 00000

Built
2003
22 years old
Condition
Good
inspected November 2024
Type
Slab
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
140
2020 count
Owner
County
County Highway Agency

About this bridge

N Adams Dr. over North Unit Main Canal is a prestressed concrete slab carrying N Adams Dr. over North Unit Main Canal in Jefferson County, Oregon. It was built in 2003, so it is 22 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 140 vehicles a day, roughly 1% of them trucks, projected to reach 160 by 2025. The structure is 25 ft (7.6 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesN Adams Dr.
CrossesNorth Unit Main Canal
Location1.01 MI N of Fir Lane
RouteCity Street 0
StateOregon
Coordinates44.72303, -121.13311
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length25 ft (7.6 m)
Longest span24 ft (7.3 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2020)
Projected traffic160 by 2025
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 N Adams Dr. over North Unit Main Canal built?

It was built in 2003, making it 22 years old in 2025.

What condition is N Adams Dr. over North Unit Main Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does N Adams Dr. over North Unit Main Canal carry?

About 140 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is N Adams Dr. over North Unit Main Canal?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m) and a deck 28 ft wide.

Who owns N Adams Dr. over North Unit Main Canal?

It is owned by the County Highway Agency.