US Bridges

Mn 135 over Dm;ir RY

Poor

St. Louis County, Minnesota · 1.4 MI S of JCT TH 37 · Structure no. 69023

Built
1970
55 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
284 ft
3 main spans
Daily traffic
6,000
2019 count
Owner
State
State Highway Agency

About this bridge

Mn 135 over Dm;ir RY is a steel continuous stringer/multi-beam or girder carrying Mn 135 over Dm;ir RY in St. Louis County, Minnesota. It was built in 1970, so it is 55 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 6,000 vehicles a day, roughly 7% of them trucks, projected to reach 6,400 by 2039. The structure is 284 ft (86.5 m) long and 48 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesMn 135
CrossesDm;ir RY
Location1.4 MI S of JCT TH 37
RouteState Highway 135
CountySt. Louis County
StateMinnesota
Coordinates47.48706, -92.43414
Functional classRural Minor Arterial

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
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment7: Better than present minimum criteria
Operating rating68.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length284 ft (86.5 m)
Longest span108 ft (32.8 m)
Deck width48 ft (14.7 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2019)
Projected traffic6,400 by 2039
Trucks7%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed14.9 mi (24 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mn 135 over Dm;ir RY built?

It was built in 1970, making it 55 years old in 2025.

What condition is Mn 135 over Dm;ir RY 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 Mn 135 over Dm;ir RY carry?

About 6,000 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is Mn 135 over Dm;ir RY?

The structure is 284 ft (86.5 m) long with a longest span of 108 ft (32.8 m) and a deck 48 ft wide.

Who owns Mn 135 over Dm;ir RY?

It is owned by the State Highway Agency.