T 237 over Upper Iowa River

Fair

Mower County, Minnesota · 0.3 MI N of JCT TH 56 · Structure no. 50563

Built: 1981; 44 years old
Condition: Fair; inspected July 2024
Type: Tee Beam; Prestressed Concrete
Length: 119 ft; 3 main spans
Daily traffic: 40; 1986 count
Owner: County; County Highway Agency

About this bridge

T 237 over Upper Iowa River is a prestressed concrete tee beam carrying T 237 over Upper Iowa River in Mower County, Minnesota. It was built in 1981, so it is 44 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 40 vehicles a day, projected to reach 40 by 2029. The structure is 119 ft (36.4 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesT 237

CrossesUpper Iowa River

Location0.3 MI N of JCT TH 56

RouteCounty Highway 237

CountyMower County

StateMinnesota

Coordinates43.52708, -92.53685

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	7 Good	Some minor problems.
Channel and channel protection	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionJuly 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 adequacy7: Better than present minimum criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating67.2 US tons

Inventory rating34.9 US tons

Structure

Structure typeTee Beam

MaterialPrestressed Concrete

DeckConcrete, precast panels

Main spans3

Design loadHS 20

Structure length119 ft (36.4 m)

Longest span39 ft (12 m)

Deck width32 ft (9.8 m)

Roadway width29 ft (8.7 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (1986)

Projected traffic40 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

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 T 237 over Upper Iowa River built?

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

What condition is T 237 over Upper Iowa 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 July 2024.

How much traffic does T 237 over Upper Iowa River carry?

About 40 vehicles per day (1986 count).

How long is T 237 over Upper Iowa River?

The structure is 119 ft (36.4 m) long with a longest span of 39 ft (12 m) and a deck 32 ft wide.

Who owns T 237 over Upper Iowa River?

It is owned by the County Highway Agency.