I 35 over Grindstone River
PoorPine County, Minnesota · 0.3 MI N of JCT TH48 · Structure no. 9787
- Built
- 1960
- 65 years old
- Condition
- Poor
- inspected April 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 114 ft
- 3 main spans
- Daily traffic
- 8,150
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
I 35 over Grindstone River is a prestressed concrete slab carrying I 35 over Grindstone River in Pine County, Minnesota. It was built in 1960, so it is 65 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 8,150 vehicles a day, roughly 7% of them trucks, projected to reach 8,150 by 2036. The structure is 114 ft (34.6 m) long and 44 ft wide. If it were closed, the detour would be 9.9 mi (16 km).
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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 35 over Grindstone River built?
It was built in 1960, making it 65 years old in 2025.
What condition is I 35 over Grindstone River 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 April 2024.
How much traffic does I 35 over Grindstone River carry?
About 8,150 vehicles per day (2016 count), of which roughly 7% are trucks.
How long is I 35 over Grindstone River?
The structure is 114 ft (34.6 m) long with a longest span of 37 ft (11.4 m) and a deck 44 ft wide.
Who owns I 35 over Grindstone River?
It is owned by the State Highway Agency.