US Bridges

Msas 171 over I 35

Fair

St. Louis County, Minnesota · 2.7 MI NE of JCT TH 535 · Structure no. 69820

Built
1983
42 years old
Condition
Fair
inspected October 2024
Type
Frame
Concrete
Length
96 ft
2 main spans
Daily traffic
9,900
2017 count
Owner
State
State Highway Agency

About this bridge

Msas 171 over I 35 is a concrete frame carrying Msas 171 over I 35 in St. Louis County, Minnesota. It was built in 1983, so it is 42 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.

It carries about 9,900 vehicles a day, projected to reach 9,900 by 2039. The structure is 96 ft (29.4 m) long and 639 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMsas 171
CrossesI 35
Location2.7 MI NE of JCT TH 535
RouteCity Street 171
CountySt. Louis County
StateMinnesota
Coordinates46.79423, -92.08895
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating42.1 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length96 ft (29.4 m)
Longest span44 ft (13.4 m)
Deck width639 ft (194.8 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,900 (2017)
Projected traffic9,900 by 2039
Trucks—
Lanes on structure4
Traffic directionTwo-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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Msas 171 over I 35 built?

It was built in 1983, making it 42 years old in 2025.

What condition is Msas 171 over I 35 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 October 2024.

How much traffic does Msas 171 over I 35 carry?

About 9,900 vehicles per day (2017 count).

How long is Msas 171 over I 35?

The structure is 96 ft (29.4 m) long with a longest span of 44 ft (13.4 m) and a deck 639 ft wide.

Who owns Msas 171 over I 35?

It is owned by the State Highway Agency.