US Bridges

Csah 12 over Nature Boy Brook

Fair

Cook County, Minnesota · 0.1 MI N of JCT Csah 7 · Structure no. 16J07

Built
2000
25 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
32 ft
2 main spans
Daily traffic
1,176
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 12 over Nature Boy Brook is a concrete culvert carrying Csah 12 over Nature Boy Brook in Cook County, Minnesota. It was built in 2000, so it is 25 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 1,176 vehicles a day, projected to reach 1,250 by 2042. The structure is 32 ft (9.8 m) long.

Location

Open in Google Maps
CarriesCsah 12
CrossesNature Boy Brook
Location0.1 MI N of JCT Csah 7
RouteCounty Highway 12
CountyCook County
StateMinnesota
Coordinates47.75853, -90.3252
Functional classRural Major 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.8 US tons
Inventory rating43.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length32 ft (9.8 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,176 (2022)
Projected traffic1,250 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 12 over Nature Boy Brook built?

It was built in 2000, making it 25 years old in 2025.

What condition is Csah 12 over Nature Boy Brook 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 October 2023.

How much traffic does Csah 12 over Nature Boy Brook carry?

About 1,176 vehicles per day (2022 count).

How long is Csah 12 over Nature Boy Brook?

The structure is 32 ft (9.8 m) long with a longest span of 13 ft (4 m).

Who owns Csah 12 over Nature Boy Brook?

It is owned by the County Highway Agency.