US Bridges

IRR Route 17 over Grand Portage Creek

Fair

Cook County, Minnesota · 0.2 KM East of Mt Rose · Structure no. 00000000000F218

Built
1935
90 years old
Condition
Fair
inspected October 2023
Type
Culvert
Steel
Length
20 ft
1 main span
Daily traffic
296
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR Route 17 over Grand Portage Creek is a steel culvert carrying IRR Route 17 over Grand Portage Creek in Cook County, Minnesota. It was built in 1935, 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 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 296 vehicles a day, roughly 30% of them trucks, projected to reach 296 by 2043. The structure is 20 ft (6.1 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesIRR Route 17
CrossesGrand Portage Creek
Location0.2 KM East of Mt Rose
RouteFederal Lands Road 17
Coordinates47.96359, -89.68364
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating32.4 US tons
Inventory rating21.6 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width29 ft (8.7 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic296 (2023)
Projected traffic296 by 2043
Trucks30%
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR Route 17 over Grand Portage Creek built?

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

What condition is IRR Route 17 over Grand Portage Creek 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 October 2023.

How much traffic does IRR Route 17 over Grand Portage Creek carry?

About 296 vehicles per day (2023 count), of which roughly 30% are trucks.

How long is IRR Route 17 over Grand Portage Creek?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 29 ft wide.

Who owns IRR Route 17 over Grand Portage Creek?

It is owned by the Bureau of Indian Affairs.