US Bridges

Csah 21 over N Br Root River

Fair

Fillmore County, Minnesota · 0.9 MI N of JCT Csah 6 · Structure no. 23521

Built
1977
48 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
252 ft
3 main spans
Daily traffic
135
2013 count
Owner
County
County Highway Agency

About this bridge

Csah 21 over N Br Root River is a steel continuous stringer/multi-beam or girder carrying Csah 21 over N Br Root River in Fillmore County, Minnesota. It was built in 1977, so it is 48 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 135 vehicles a day, projected to reach 135 by 2039. The structure is 252 ft (76.7 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCsah 21
CrossesN Br Root River
Location0.9 MI N of JCT Csah 6
RouteCounty Highway 21
CountyFillmore County
StateMinnesota
Coordinates43.78269, -92.03223
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.7 US tons
Inventory rating42.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length252 ft (76.7 m)
Longest span95 ft (29 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic135 (2013)
Projected traffic135 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 N Br Root River built?

It was built in 1977, making it 48 years old in 2025.

What condition is Csah 21 over N Br Root 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 April 2024.

How much traffic does Csah 21 over N Br Root River carry?

About 135 vehicles per day (2013 count).

How long is Csah 21 over N Br Root River?

The structure is 252 ft (76.7 m) long with a longest span of 95 ft (29 m) and a deck 36 ft wide.

Who owns Csah 21 over N Br Root River?

It is owned by the County Highway Agency.