US Bridges

North Boundary RD over Thief River/N. Boundary

Fair

Marshall County, Minnesota · Sec 17 T157N R41W · Structure no. 000032510-00018

Built
1979
46 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
56 ft
3 main spans
Daily traffic
25
2023 count
Owner
Federal
Bureau of Fish and Wildlife

About this bridge

North Boundary RD over Thief River/N. Boundary is a wood or timber stringer/multi-beam or girder carrying North Boundary RD over Thief River/N. Boundary in Marshall County, Minnesota. It was built in 1979, so it is 46 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.

It carries about 25 vehicles a day, projected to reach 30 by 2043. The structure is 56 ft (17.1 m) long and 12 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNorth Boundary RD
CrossesThief River/N. Boundary
LocationSec 17 T157N R41W
RouteFederal Lands Road 0
CountyMarshall County
StateMinnesota
Coordinates48.42683, -95.96983
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.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length56 ft (17.1 m)
Longest span18 ft (5.5 m)
Deck width12 ft (3.7 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deck107 ft (32.7 m)

Traffic and service

Average daily traffic25 (2023)
Projected traffic30 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Fish and Wildlife
Maintained byBureau of Fish and Wildlife
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was North Boundary RD over Thief River/N. Boundary built?

It was built in 1979, making it 46 years old in 2025.

What condition is North Boundary RD over Thief River/N. Boundary 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 August 2023.

How much traffic does North Boundary RD over Thief River/N. Boundary carry?

About 25 vehicles per day (2023 count).

How long is North Boundary RD over Thief River/N. Boundary?

The structure is 56 ft (17.1 m) long with a longest span of 18 ft (5.5 m) and a deck 12 ft wide.

Who owns North Boundary RD over Thief River/N. Boundary?

It is owned by the Bureau of Fish and Wildlife.