Route 31 over Mill Brook
FairTolland County, Connecticut · 1 MI West of Mansfield Tl · Structure no. 03278
- Built
- 1870
- 155 years old
- Condition
- Fair
- inspected October 2024
- Type
- Arch - Deck
- Concrete
- Length
- 24 ft
- 2 main spans
- Daily traffic
- 4,800
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Route 31 over Mill Brook is a concrete arch - deck carrying Route 31 over Mill Brook in Tolland County, Connecticut. It was built in 1870, so it is 155 years old, older than the Connecticut average of 56.7 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 4,800 vehicles a day, roughly 3% of them trucks, projected to reach 7,132 by 2043. The structure is 24 ft (7.3 m) long and 28 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 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Route 31 over Mill Brook built?
It was built in 1870, making it 155 years old in 2025.
What condition is Route 31 over Mill Brook 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 Route 31 over Mill Brook carry?
About 4,800 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is Route 31 over Mill Brook?
The structure is 24 ft (7.3 m) long with a longest span of 11 ft (3.4 m) and a deck 28 ft wide.
Who owns Route 31 over Mill Brook?
It is owned by the State Highway Agency.