US Bridges

CR 88 over Knife River

Fair

Kanabec County, Minnesota · 0.1 MI W of JCT Csah 8 · Structure no. 33533

Built
2002
23 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete
Length
110 ft
3 main spans
Daily traffic
105
2014 count
Owner
County
County Highway Agency

About this bridge

CR 88 over Knife River is a concrete slab carrying CR 88 over Knife River in Kanabec County, Minnesota. It was built in 2002, so it is 23 years old, younger 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 105 vehicles a day, projected to reach 105 by 2039. The structure is 110 ft (33.4 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCR 88
CrossesKnife River
Location0.1 MI W of JCT Csah 8
RouteCounty Highway 88
Coordinates45.98169, -93.33889
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.9 US tons
Inventory rating39.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length110 ft (33.4 m)
Longest span41 ft (12.5 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic105 (2014)
Projected traffic105 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 88 over Knife River built?

It was built in 2002, making it 23 years old in 2025.

What condition is CR 88 over Knife River 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 November 2023.

How much traffic does CR 88 over Knife River carry?

About 105 vehicles per day (2014 count).

How long is CR 88 over Knife River?

The structure is 110 ft (33.4 m) long with a longest span of 41 ft (12.5 m) and a deck 32 ft wide.

Who owns CR 88 over Knife River?

It is owned by the County Highway Agency.