US Bridges

T 85 over Tamarac River

Good

Marshall County, Minnesota · 0.5 MI W of JCT CR 109 · Structure no. 45543

Built
1989
36 years old
Condition
Good
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
84 ft
2 main spans
Daily traffic
42
1994 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 85 over Tamarac River is a prestressed concrete tee beam carrying T 85 over Tamarac River in Marshall County, Minnesota. It was built in 1989, so it is 36 years old, younger than the Minnesota average of 38.5 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 42 vehicles a day, projected to reach 42 by 2029. The structure is 84 ft (25.7 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesT 85
CrossesTamarac River
Location0.5 MI W of JCT CR 109
RouteCounty Highway 85
Coordinates48.42706, -96.84635
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.8 US tons
Inventory rating31.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length84 ft (25.7 m)
Longest span41 ft (12.6 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42 (1994)
Projected traffic42 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 T 85 over Tamarac River built?

It was built in 1989, making it 36 years old in 2025.

What condition is T 85 over Tamarac River 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 October 2023.

How much traffic does T 85 over Tamarac River carry?

About 42 vehicles per day (1994 count).

How long is T 85 over Tamarac River?

The structure is 84 ft (25.7 m) long with a longest span of 41 ft (12.6 m) and a deck 32 ft wide.

Who owns T 85 over Tamarac River?

It is owned by the Town or Township Highway Agency.