US Bridges

Csah 21 over Shell River

Good

Wadena County, Minnesota · 1.1 MI W of JCT CSAH23 · Structure no. 80526

Built
1998
27 years old
Condition
Good
inspected June 2024
Type
Slab
Concrete Continuous
Length
159 ft
3 main spans
Daily traffic
609
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 21 over Shell River is a concrete continuous slab carrying Csah 21 over Shell River in Wadena County, Minnesota. It was built in 1998, so it is 27 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 609 vehicles a day, projected to reach 760 by 2042. The structure is 159 ft (48.6 m) long and 39 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesCsah 21
CrossesShell River
Location1.1 MI W of JCT CSAH23
RouteCounty Highway 21
Coordinates46.80332, -95.03416
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating76.8 US tons
Inventory rating46 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length159 ft (48.6 m)
Longest span63 ft (19.2 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic609 (2022)
Projected traffic760 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Csah 21 over Shell River built?

It was built in 1998, making it 27 years old in 2025.

What condition is Csah 21 over Shell 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 June 2024.

How much traffic does Csah 21 over Shell River carry?

About 609 vehicles per day (2022 count).

How long is Csah 21 over Shell River?

The structure is 159 ft (48.6 m) long with a longest span of 63 ft (19.2 m) and a deck 39 ft wide.

Who owns Csah 21 over Shell River?

It is owned by the County Highway Agency.