US Bridges

M 980 over Blackdog Creek

FairPosted for load

Dakota County, Minnesota · 0.1 MI W of TH 77 · Structure no. L5773

Built
1953
72 years old
Condition
Fair
inspected July 2024
Type
Frame
Concrete
Length
26 ft
1 main span
Daily traffic
872
1987 count
Owner
City
City or Municipal Highway Agency

About this bridge

M 980 over Blackdog Creek is a concrete frame carrying M 980 over Blackdog Creek in Dakota County, Minnesota. It was built in 1953, so it is 72 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. Its operating status is: posted for load restriction.

It carries about 872 vehicles a day, projected to reach 872 by 2029. The structure is 26 ft (7.9 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM 980
CrossesBlackdog Creek
Location0.1 MI W of TH 77
RouteCity Street 980
CountyDakota County
StateMinnesota
Coordinates44.82501, -93.23348
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating25.6 US tons
Inventory rating15.3 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span22 ft (6.7 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic872 (1987)
Projected traffic872 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$62 million
NavigationNo navigation control on waterway

Frequently asked questions

When was M 980 over Blackdog Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is M 980 over Blackdog Creek 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 July 2024.

How much traffic does M 980 over Blackdog Creek carry?

About 872 vehicles per day (1987 count).

How long is M 980 over Blackdog Creek?

The structure is 26 ft (7.9 m) long with a longest span of 22 ft (6.7 m) and a deck 24 ft wide.

Who owns M 980 over Blackdog Creek?

It is owned by the City or Municipal Highway Agency.