US Bridges

Alder ST over Mill Race Canal

Good

Lane County, Oregon · City of Eugene · Structure no. 40032 000

Built
1961
64 years old
Condition
Good
inspected May 2023
Type
Slab
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
5,786
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Alder ST over Mill Race Canal is a prestressed concrete slab carrying Alder ST over Mill Race Canal in Lane County, Oregon. It was built in 1961, so it is 64 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,786 vehicles a day, roughly 5% of them trucks, projected to reach 6,536 by 2025. The structure is 28 ft (8.5 m) long and 54 ft wide.

CarriesAlder ST
CrossesMill Race Canal
LocationCity of Eugene
RouteCity Street C0000
StateOregon
Coordinates44.04853, -123.0802
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating36.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width54 ft (16.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,786 (2020)
Projected traffic6,536 by 2025
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Alder ST over Mill Race Canal built?

It was built in 1961, making it 64 years old in 2025.

What condition is Alder ST over Mill Race 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 May 2023.

How much traffic does Alder ST over Mill Race Canal carry?

About 5,786 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Alder ST over Mill Race Canal?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 54 ft wide.

Who owns Alder ST over Mill Race Canal?

It is owned by the City or Municipal Highway Agency.