US Bridges

Mn 30 over Blue Earth River

Fair

Blue Earth County, Minnesota · 1.4 MI W of N JCT TH 169 · Structure no. 07038

Built
1984
41 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
316 ft
3 main spans
Daily traffic
782
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 30 over Blue Earth River is a steel continuous stringer/multi-beam or girder carrying Mn 30 over Blue Earth River in Blue Earth County, Minnesota. It was built in 1984, so it is 41 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 782 vehicles a day, roughly 15% of them trucks, projected to reach 890 by 2042. The structure is 316 ft (96.3 m) long and 50 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesMn 30
CrossesBlue Earth River
Location1.4 MI W of N JCT TH 169
RouteState Highway 30
Coordinates43.8946, -94.19917
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating77.2 US tons
Inventory rating46.3 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length316 ft (96.3 m)
Longest span121 ft (36.9 m)
Deck width50 ft (15.3 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic782 (2022)
Projected traffic890 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 30 over Blue Earth River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Mn 30 over Blue Earth River 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 June 2024.

How much traffic does Mn 30 over Blue Earth River carry?

About 782 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is Mn 30 over Blue Earth River?

The structure is 316 ft (96.3 m) long with a longest span of 121 ft (36.9 m) and a deck 50 ft wide.

Who owns Mn 30 over Blue Earth River?

It is owned by the State Highway Agency.