US Bridges

Tomahawk Road over Island River

Poor

Lake County, Minnesota · 15.4 MI NE of JCT TH 1 · Structure no. 090902000001029

Built
1954
71 years old
Condition
Poor
inspected September 2023
Type
Culvert
Steel
Length
29 ft
2 main spans
Daily traffic
4
1973 count
Owner
Federal
U.S. Forest Service

About this bridge

Tomahawk Road over Island River is a steel culvert carrying Tomahawk Road over Island River in Lake County, Minnesota. It was built in 1954, so it is 71 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.

It carries about 4 vehicles a day, projected to reach 6 by 2045. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 98.2 mi (158 km).

Location

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CarriesTomahawk Road
CrossesIsland River
Location15.4 MI NE of JCT TH 1
RouteFederal Lands Road 356
CountyLake County
StateMinnesota
Coordinates47.76056, -91.18417
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating33.6 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length29 ft (8.8 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4 (1973)
Projected traffic6 by 2045
Trucks—
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 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 Tomahawk Road over Island River built?

It was built in 1954, making it 71 years old in 2025.

What condition is Tomahawk Road over Island 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 September 2023.

How much traffic does Tomahawk Road over Island River carry?

About 4 vehicles per day (1973 count).

How long is Tomahawk Road over Island River?

The structure is 29 ft (8.8 m) long with a longest span of 13 ft (4 m).

Who owns Tomahawk Road over Island River?

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