M 99 over Prior Lake
FairPosted for loadScott County, Minnesota · W of Martinson Island · Structure no. 70513
- Built
- 1986
- 39 years old
- Condition
- Fair
- inspected July 2023
- Type
- Slab
- Wood or Timber
- Length
- 72 ft
- 3 main spans
- Daily traffic
- 400
- 1995 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
M 99 over Prior Lake is a wood or timber slab carrying M 99 over Prior Lake in Scott County, Minnesota. It was built in 1986, so it is 39 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. Its operating status is: posted for load restriction.
It carries about 400 vehicles a day, projected to reach 400 by 2029. The structure is 72 ft (21.9 m) long and 30 ft wide. If it were closed, the detour would be 123 mi (198 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M 99 over Prior Lake built?
It was built in 1986, making it 39 years old in 2025.
What condition is M 99 over Prior Lake 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 July 2023.
How much traffic does M 99 over Prior Lake carry?
About 400 vehicles per day (1995 count).
How long is M 99 over Prior Lake?
The structure is 72 ft (21.9 m) long with a longest span of 24 ft (7.3 m) and a deck 30 ft wide.
Who owns M 99 over Prior Lake?
It is owned by the City or Municipal Highway Agency.