US Bridges

T 171 over Cedar Run

Fair

Martin County, Minnesota · 1.5 MI W of JCT Csah 9 · Structure no. L5974

Built
1975
50 years old
Condition
Fair
inspected October 2024
Type
Channel Beam
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
34
1986 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 171 over Cedar Run is a prestressed concrete channel beam carrying T 171 over Cedar Run in Martin County, Minnesota. It was built in 1975, so it is 50 years old, older than the Minnesota average of 38.5 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 34 vehicles a day, projected to reach 34 by 2029. The structure is 31 ft (9.4 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesT 171
CrossesCedar Run
Location1.5 MI W of JCT Csah 9
RouteCounty Highway 171
Coordinates43.80522, -94.80532
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.3 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (1986)
Projected traffic34 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 171 over Cedar Run built?

It was built in 1975, making it 50 years old in 2025.

What condition is T 171 over Cedar Run 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 October 2024.

How much traffic does T 171 over Cedar Run carry?

About 34 vehicles per day (1986 count).

How long is T 171 over Cedar Run?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns T 171 over Cedar Run?

It is owned by the Town or Township Highway Agency.