US Bridges

Csah 21 over Little Rock Creek

Good

Nicollet County, Minnesota · 6.1 MI SE of JCT TH 4 · Structure no. 52511

Built
1997
28 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
83 ft
1 main span
Daily traffic
475
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 21 over Little Rock Creek is a wood or timber stringer/multi-beam or girder carrying Csah 21 over Little Rock Creek in Nicollet County, Minnesota. It was built in 1997, so it is 28 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 475 vehicles a day, projected to reach 465 by 2039. The structure is 83 ft (25.4 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCsah 21
CrossesLittle Rock Creek
Location6.1 MI SE of JCT TH 4
RouteCounty Highway 21
Coordinates44.39463, -94.62099
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating71.5 US tons
Inventory rating44.6 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length83 ft (25.4 m)
Longest span78 ft (23.9 m)
Deck width38 ft (11.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic475 (2019)
Projected traffic465 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Little Rock Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is Csah 21 over Little Rock Creek 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 November 2023.

How much traffic does Csah 21 over Little Rock Creek carry?

About 475 vehicles per day (2019 count).

How long is Csah 21 over Little Rock Creek?

The structure is 83 ft (25.4 m) long with a longest span of 78 ft (23.9 m) and a deck 38 ft wide.

Who owns Csah 21 over Little Rock Creek?

It is owned by the County Highway Agency.