US Bridges

Mn 73 over Hasty Brook

Fair

Carlton County, Minnesota · 5.3 MI N of JCT TH 210 · Structure no. 4077

Built
1923
102 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
1,700
2018 count
Owner
State
State Highway Agency

About this bridge

Mn 73 over Hasty Brook is a concrete culvert carrying Mn 73 over Hasty Brook in Carlton County, Minnesota. It was built in 1923, so it is 102 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 1,700 vehicles a day, roughly 11% of them trucks, projected to reach 1,750 by 2038. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesMn 73
CrossesHasty Brook
Location5.3 MI N of JCT TH 210
RouteState Highway 73
CountyCarlton County
StateMinnesota
Coordinates46.75515, -92.8831
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating32.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2018)
Projected traffic1,750 by 2038
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Mn 73 over Hasty Brook built?

It was built in 1923, making it 102 years old in 2025.

What condition is Mn 73 over Hasty 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 June 2023.

How much traffic does Mn 73 over Hasty Brook carry?

About 1,700 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is Mn 73 over Hasty Brook?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns Mn 73 over Hasty Brook?

It is owned by the State Highway Agency.