US Bridges

Fourmile Lake Road over Temperance River

Good

Cook County, Minnesota · 3.35 MI NE of JCT Csah 2 · Structure no. 090907000001013

Built
1959
66 years old
Condition
Good
inspected August 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
34
1973 count
Owner
Federal
U.S. Forest Service

About this bridge

Fourmile Lake Road over Temperance River is a steel stringer/multi-beam or girder carrying Fourmile Lake Road over Temperance River in Cook County, Minnesota. It was built in 1959, so it is 66 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 34 vehicles a day, projected to reach 51 by 2045. The structure is 39 ft (11.9 m) long and 24 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesFourmile Lake Road
CrossesTemperance River
Location3.35 MI NE of JCT Csah 2
RouteFederal Lands Road 170
Coordinates47.82538, -90.83523
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating60 US tons
Inventory rating46.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span37 ft (11.4 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (1973)
Projected traffic51 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Fourmile Lake Road over Temperance River built?

It was built in 1959, making it 66 years old in 2025.

What condition is Fourmile Lake Road over Temperance 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 August 2021.

How much traffic does Fourmile Lake Road over Temperance River carry?

About 34 vehicles per day (1973 count).

How long is Fourmile Lake Road over Temperance River?

The structure is 39 ft (11.9 m) long with a longest span of 37 ft (11.4 m) and a deck 24 ft wide.

Who owns Fourmile Lake Road over Temperance River?

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