US Bridges

T 31 over S Br Buffalo River

PoorPosted for load

Clay County, Minnesota · 1.4 MI E of JCT Csah 11 · Structure no. L8228

Built
1948
77 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
94 ft
3 main spans
Daily traffic
51
1986 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 31 over S Br Buffalo River is a wood or timber stringer/multi-beam or girder carrying T 31 over S Br Buffalo River in Clay County, Minnesota. It was built in 1948, so it is 77 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 51 vehicles a day, projected to reach 51 by 2029. The structure is 94 ft (28.8 m) long and 22 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesT 31
CrossesS Br Buffalo River
Location1.4 MI E of JCT Csah 11
RouteCounty Highway 31
Coordinates46.86242, -96.6222
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating22.5 US tons
Inventory rating13.4 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length94 ft (28.8 m)
Longest span30 ft (9.1 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51 (1986)
Projected traffic51 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$264 million
NavigationNo navigation control on waterway

Frequently asked questions

When was T 31 over S Br Buffalo River built?

It was built in 1948, making it 77 years old in 2025.

What condition is T 31 over S Br Buffalo River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does T 31 over S Br Buffalo River carry?

About 51 vehicles per day (1986 count).

How long is T 31 over S Br Buffalo River?

The structure is 94 ft (28.8 m) long with a longest span of 30 ft (9.1 m) and a deck 22 ft wide.

Who owns T 31 over S Br Buffalo River?

It is owned by the Town or Township Highway Agency.