US Bridges

Csah 6 over Blackhoof Creek

Poor

Carlton County, Minnesota · 3.5 MI E;n of JCT Csah 5 · Structure no. 09518

Built
1918
107 years old
Condition
Poor
inspected December 2024
Type
Culvert
Concrete
Length
31 ft
1 main span
Daily traffic
420
2020 count
Owner
County
County Highway Agency

About this bridge

Csah 6 over Blackhoof Creek is a concrete culvert carrying Csah 6 over Blackhoof Creek in Carlton County, Minnesota. It was built in 1918, so it is 107 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 420 vehicles a day, projected to reach 275 by 2040. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesCsah 6
CrossesBlackhoof Creek
Location3.5 MI E;n of JCT Csah 5
RouteCounty Highway 6
CountyCarlton County
StateMinnesota
Coordinates46.52808, -92.47166
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating39.6 US tons
Inventory rating28.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span27 ft (8.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic420 (2020)
Projected traffic275 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 6 over Blackhoof Creek built?

It was built in 1918, making it 107 years old in 2025.

What condition is Csah 6 over Blackhoof Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does Csah 6 over Blackhoof Creek carry?

About 420 vehicles per day (2020 count).

How long is Csah 6 over Blackhoof Creek?

The structure is 31 ft (9.4 m) long with a longest span of 27 ft (8.2 m).

Who owns Csah 6 over Blackhoof Creek?

It is owned by the County Highway Agency.