US Bridges

Mn 13 over Happy Hollow

Fair

Dakota County, Minnesota · 1.0 MI NE of JCT TH 35E · Structure no. 19077

Built
1979
46 years old
Condition
Fair
inspected September 2024
Type
Frame
Steel Continuous
Length
344 ft
3 main spans
Daily traffic
6,528
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 13 over Happy Hollow is a steel continuous frame carrying Mn 13 over Happy Hollow in Dakota County, Minnesota. It was built in 1979, so it is 46 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 5 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 6,528 vehicles a day, roughly 2% of them trucks, projected to reach 6,300 by 2042. The structure is 344 ft (104.9 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMn 13
CrossesHappy Hollow
Location1.0 MI NE of JCT TH 35E
RouteState Highway 13
CountyDakota County
StateMinnesota
Coordinates44.91036, -93.12381
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating108 US tons
Inventory rating64.8 US tons

Structure

Structure typeFrame
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length344 ft (104.9 m)
Longest span150 ft (45.7 m)
Deck width54 ft (16.6 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,528 (2022)
Projected traffic6,300 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 13 over Happy Hollow built?

It was built in 1979, making it 46 years old in 2025.

What condition is Mn 13 over Happy Hollow 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 September 2024.

How much traffic does Mn 13 over Happy Hollow carry?

About 6,528 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Mn 13 over Happy Hollow?

The structure is 344 ft (104.9 m) long with a longest span of 150 ft (45.7 m) and a deck 54 ft wide.

Who owns Mn 13 over Happy Hollow?

It is owned by the State Highway Agency.