US Bridges

Mn 135 over Dm&ir RY

Poor

St. Louis County, Minnesota · 9.5 MI E of S JCT TH53 · Structure no. 69025

Built
1971
54 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
179 ft
3 main spans
Daily traffic
3,830
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 135 over Dm&ir RY is a prestressed concrete stringer/multi-beam or girder carrying Mn 135 over Dm&ir RY in St. Louis County, Minnesota. It was built in 1971, so it is 54 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 3 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 3,830 vehicles a day, roughly 6% of them trucks, projected to reach 4,300 by 2042. The structure is 179 ft (54.6 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
Location9.5 MI E of S JCT TH53
RouteState Highway 135
CountySt. Louis County
StateMinnesota
Coordinates47.52394, -92.35603
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.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating74.8 US tons
Inventory rating38.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length179 ft (54.6 m)
Longest span73 ft (22.2 m)
Deck width48 ft (14.7 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,830 (2022)
Projected traffic4,300 by 2042
Trucks6%
Lanes on structure2
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 1971, making it 54 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 November 2024.

How much traffic does Mn 135 over Dm&ir RY carry?

About 3,830 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Mn 135 over Dm&ir RY?

The structure is 179 ft (54.6 m) long with a longest span of 73 ft (22.2 m) and a deck 48 ft wide.

Who owns Mn 135 over Dm&ir RY?

It is owned by the State Highway Agency.