US Bridges

Trappers Lake RD over Dumbbell River

Good

Lake County, Minnesota · 12.8MI W of JCT Csah 7 · Structure no. 090907000034765

Built
2023
2 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
35
Owner
Federal
U.S. Forest Service

About this bridge

Trappers Lake RD over Dumbbell River is a steel stringer/multi-beam or girder carrying Trappers Lake RD over Dumbbell River in Lake County, Minnesota. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 35 vehicles a day, projected to reach 52 by 2045. The structure is 41 ft (12.6 m) long and 26 ft wide. If it were closed, the detour would be 17.4 mi (28 km).

CarriesTrappers Lake RD
CrossesDumbbell River
Location12.8MI W of JCT Csah 7
RouteFederal Lands Road 369
Coordinates47.71109, -91.20188
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating55.7 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadHL 93
Structure length41 ft (12.6 m)
Longest span41 ft (12.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (—)
Projected traffic52 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed17.4 mi (28 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Trappers Lake RD over Dumbbell River built?

It was built in 2023, making it 2 years old in 2025.

What condition is Trappers Lake RD over Dumbbell 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 November 2023.

How much traffic does Trappers Lake RD over Dumbbell River carry?

About 35 vehicles per day (latest count).

How long is Trappers Lake RD over Dumbbell River?

The structure is 41 ft (12.6 m) long with a longest span of 41 ft (12.4 m) and a deck 26 ft wide.

Who owns Trappers Lake RD over Dumbbell River?

It is owned by the U.S. Forest Service.