US Bridges

Hill Road over Mohawk River

Fair

Lane County, Oregon · 035 MI NE Springfield · Structure no. 39C166195600010

Built
1981
44 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
167 ft
3 main spans
Daily traffic
1,732
2020 count
Owner
County
County Highway Agency

About this bridge

Hill Road over Mohawk River is a prestressed concrete slab carrying Hill Road over Mohawk River in Lane County, Oregon. It was built in 1981, so it is 44 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 1,732 vehicles a day, roughly 10% of them trucks, projected to reach 1,962 by 2025. The structure is 167 ft (50.9 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesHill Road
CrossesMohawk River
Location035 MI NE Springfield
RouteCounty Highway C1956
CountyLane County
StateOregon
Coordinates44.09278, -122.95644
Functional classRural Minor Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum 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 rating56.4 US tons
Inventory rating43.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length167 ft (50.9 m)
Longest span68 ft (20.7 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,732 (2020)
Projected traffic1,962 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Hill Road over Mohawk River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Hill Road over Mohawk 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 August 2024.

How much traffic does Hill Road over Mohawk River carry?

About 1,732 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Hill Road over Mohawk River?

The structure is 167 ft (50.9 m) long with a longest span of 68 ft (20.7 m) and a deck 32 ft wide.

Who owns Hill Road over Mohawk River?

It is owned by the County Highway Agency.