US Bridges

Mn 51 over TH 36

Fair

Ramsey County, Minnesota · At the JCT TH 36; 51 SB · Structure no. 9012

Built
1958
67 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
230 ft
4 main spans
Daily traffic
15,773
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 51 over TH 36 is a steel continuous stringer/multi-beam or girder carrying Mn 51 over TH 36 in Ramsey County, Minnesota. It was built in 1958, so it is 67 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 15,773 vehicles a day, roughly 2% of them trucks, projected to reach 15,750 by 2042. The structure is 230 ft (70.1 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMn 51
CrossesTH 36
LocationAt the JCT TH 36; 51 SB
RouteState Highway 51
CountyRamsey County
StateMinnesota
Coordinates45.01025, -93.16663
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length230 ft (70.1 m)
Longest span79 ft (24.1 m)
Deck width48 ft (14.7 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,773 (2022)
Projected traffic15,750 by 2042
Trucks2%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$67 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mn 51 over TH 36 built?

It was built in 1958, making it 67 years old in 2025.

What condition is Mn 51 over TH 36 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 May 2024.

How much traffic does Mn 51 over TH 36 carry?

About 15,773 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Mn 51 over TH 36?

The structure is 230 ft (70.1 m) long with a longest span of 79 ft (24.1 m) and a deck 48 ft wide.

Who owns Mn 51 over TH 36?

It is owned by the State Highway Agency.