Mn 78 over US 10
PoorOtter Tail County, Minnesota · At the JCT of TH 78 · Structure no. 56007
- Built
- 1974
- 51 years old
- Condition
- Poor
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 310 ft
- 4 main spans
- Daily traffic
- 6,500
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
Mn 78 over US 10 is a prestressed concrete stringer/multi-beam or girder carrying Mn 78 over US 10 in Otter Tail County, Minnesota. It was built in 1974, so it is 51 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 6,500 vehicles a day, roughly 17% of them trucks, projected to reach 6,600 by 2039. The structure is 310 ft (94.6 m) long and 50 ft wide.
Location
Open in Google MapsCondition and inspection
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.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mn 78 over US 10 built?
It was built in 1974, making it 51 years old in 2025.
What condition is Mn 78 over US 10 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 October 2024.
How much traffic does Mn 78 over US 10 carry?
About 6,500 vehicles per day (2019 count), of which roughly 17% are trucks.
How long is Mn 78 over US 10?
The structure is 310 ft (94.6 m) long with a longest span of 92 ft (28 m) and a deck 50 ft wide.
Who owns Mn 78 over US 10?
It is owned by the State Highway Agency.