US Bridges

IRR BIA RTE 8 over Nett Lake River

Good

Koochiching County, Minnesota · 3.5KM N Boise Forte Tower · Structure no. 00000000000F216

Built
1935
90 years old, rebuilt 2008
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
10
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 8 over Nett Lake River is a prestressed concrete stringer/multi-beam or girder carrying IRR BIA RTE 8 over Nett Lake River in Koochiching County, Minnesota. It was built in 1935 and reconstructed in 2008, so it is 90 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 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 10 vehicles a day, roughly 20% of them trucks, projected to reach 15 by 2043. The structure is 76 ft (23.2 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesIRR BIA RTE 8
CrossesNett Lake River
Location3.5KM N Boise Forte Tower
RouteFederal Lands Road 8
Coordinates48.15528, -93.31111
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating87.1 US tons
Inventory rating59.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length76 ft (23.2 m)
Longest span76 ft (23.2 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2023)
Projected traffic15 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR BIA RTE 8 over Nett Lake River built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2008.

What condition is IRR BIA RTE 8 over Nett Lake 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 September 2023.

How much traffic does IRR BIA RTE 8 over Nett Lake River carry?

About 10 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is IRR BIA RTE 8 over Nett Lake River?

The structure is 76 ft (23.2 m) long with a longest span of 76 ft (23.2 m) and a deck 31 ft wide.

Who owns IRR BIA RTE 8 over Nett Lake River?

It is owned by the Bureau of Indian Affairs.