Spr 12 over Trout Brook (tributary)

FairPosted for load

Washington County, Minnesota · Entr to Afton State Park · Structure no. 82519

Built: 1980; 45 years old
Condition: Fair; inspected October 2024
Type: Slab; Wood or Timber
Length: 82 ft; 3 main spans
Daily traffic: 1; 2009 count
Owner: State; State Park, Forest, or Reservation Agency

About this bridge

Spr 12 over Trout Brook (tributary) is a wood or timber slab carrying Spr 12 over Trout Brook (tributary) in Washington County, Minnesota. It was built in 1980, so it is 45 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. Its operating status is: posted for load restriction.

It carries about 1 vehicles a day, projected to reach 1 by 2029. The structure is 82 ft (25.1 m) long and 32 ft wide. If it were closed, the detour would be 123 mi (198 km).

Location

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CarriesSpr 12

CrossesTrout Brook (tributary)

LocationEntr to Afton State Park

RouteState Lands Road 12

CountyWashington County

StateMinnesota

Coordinates44.8451, -92.7869

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	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionOctober 2024

Inspection intervalevery 24 months

Operating statusPosted for load restriction

ScourScour critical; foundations unstable for calculated scour conditions

Structural evaluation6: Equal to present minimum criteria

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating40.9 US tons

Inventory rating27.4 US tons

Structure

Structure typeSlab

MaterialWood or Timber

DeckWood or timber

Main spans3

Design loadUnknown

Structure length82 ft (25.1 m)

Longest span31 ft (9.6 m)

Deck width32 ft (9.8 m)

Roadway width21 ft (6.5 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1 (2009)

Projected traffic1 by 2029

Trucks—

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway and pedestrian

CrossesWaterway

Detour if closed123 mi (198 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency

Maintained byState Park, Forest, or Reservation 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 Spr 12 over Trout Brook (tributary) built?

It was built in 1980, making it 45 years old in 2025.

What condition is Spr 12 over Trout Brook (tributary) 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 Spr 12 over Trout Brook (tributary) carry?

About 1 vehicles per day (2009 count).

How long is Spr 12 over Trout Brook (tributary)?

The structure is 82 ft (25.1 m) long with a longest span of 31 ft (9.6 m) and a deck 32 ft wide.

Who owns Spr 12 over Trout Brook (tributary)?

It is owned by the State Park, Forest, or Reservation Agency.