US Bridges

CR 101 over Black River

Poor

Koochiching County, Minnesota · 2.3 MI SW of JCT Csah 32 · Structure no. 36506

Built
1922
103 years old
Condition
Poor
inspected September 2024
Type
Slab
Wood or Timber
Length
75 ft
1 main span
Daily traffic
97
2021 count
Owner
County
County Highway Agency

About this bridge

CR 101 over Black River is a wood or timber slab carrying CR 101 over Black River in Koochiching County, Minnesota. It was built in 1922, so it is 103 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 97 vehicles a day, projected to reach 30 by 2041. The structure is 75 ft (22.9 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesCR 101
CrossesBlack River
Location2.3 MI SW of JCT Csah 32
RouteCounty Highway 101
CountyKoochiching County
StateMinnesota
Coordinates48.47021, -94.11436
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67 US tons
Inventory rating49.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span39 ft (12 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic97 (2021)
Projected traffic30 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$1,000 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 101 over Black River built?

It was built in 1922, making it 103 years old in 2025.

What condition is CR 101 over Black River 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 September 2024.

How much traffic does CR 101 over Black River carry?

About 97 vehicles per day (2021 count).

How long is CR 101 over Black River?

The structure is 75 ft (22.9 m) long with a longest span of 39 ft (12 m) and a deck 24 ft wide.

Who owns CR 101 over Black River?

It is owned by the County Highway Agency.