US Bridges

L.Isabella R. Road over L.Isabella River

Poor

Lake County, Minnesota · 0.8 MI W of JCT FR 177 · Structure no. 090907000001105

Built
1974
51 years old
Condition
Poor
inspected August 2024
Type
Culvert
Steel
Length
22 ft
2 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

L.Isabella R. Road over L.Isabella River is a steel culvert carrying L.Isabella R. Road over L.Isabella River in Lake County, Minnesota. It was built in 1974, so it is 51 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 22 ft (6.6 m) long. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesL.Isabella R. Road
CrossesL.Isabella River
Location0.8 MI W of JCT FR 177
RouteFederal Lands Road 949
CountyLake County
StateMinnesota
Coordinates47.67583, -91.46333
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.6 m)
Longest span0 ft (0 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
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 L.Isabella R. Road over L.Isabella River built?

It was built in 1974, making it 51 years old in 2025.

What condition is L.Isabella R. Road over L.Isabella 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 August 2024.

How much traffic does L.Isabella R. Road over L.Isabella River carry?

About 50 vehicles per day (latest count).

How long is L.Isabella R. Road over L.Isabella River?

The structure is 22 ft (6.6 m) long.

Who owns L.Isabella R. Road over L.Isabella River?

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