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Route 17 over Allyns Brook

Middlesex County, Connecticut · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Route 17 over Allyns Brook in Middlesex County, Connecticut, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1995, making it 30 years old at the 2025 inventory.
It carries about 15,200 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 196 of the 309 inventoried bridges in Middlesex County rated fair (63.4%); 13 (4.2%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 83 ft
Location	0.6 Mi N. of Route 79
NBI structure number	06513
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Connecticut department of transportation.

Bridge	Built	Vehicles/day	Condition
Interstate-91 over Falls Brook	1965	108,700	Good
Interstate-91 NB over Mattabesset River	1965	99,500	Fair
Interstate-95 over Cow Hill Road	1957	62,400	Fair
Interstate-95 over Route 9 NB & I-95 Tr 816	1992	62,200	Fair
Route 9 over Game Area Road	1968	61,300	Good
Interstate-95 over Indian Lake	1957	59,800	Fair