US Bridges

Csah 21 over Grand Marais CR

Good

Polk County, Minnesota · 1.0 MI E of JCT Csah 64 · Structure no. 60L56

Built
2024
1 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
46 ft
3 main spans
Daily traffic
163
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 21 over Grand Marais CR is a concrete culvert carrying Csah 21 over Grand Marais CR in Polk County, Minnesota. It was built in 2024, so it is 1 years old, younger 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 163 vehicles a day, projected to reach 196 by 2042. The structure is 46 ft (13.9 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesCsah 21
CrossesGrand Marais CR
Location1.0 MI E of JCT Csah 64
RouteCounty Highway 21
CountyPolk County
StateMinnesota
Coordinates48.02077, -97.02331
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length46 ft (13.9 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic163 (2022)
Projected traffic196 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 21 over Grand Marais CR built?

It was built in 2024, making it 1 years old in 2025.

What condition is Csah 21 over Grand Marais CR 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 October 2024.

How much traffic does Csah 21 over Grand Marais CR carry?

About 163 vehicles per day (2022 count).

How long is Csah 21 over Grand Marais CR?

The structure is 46 ft (13.9 m) long with a longest span of 14 ft (4.3 m).

Who owns Csah 21 over Grand Marais CR?

It is owned by the County Highway Agency.