US Bridges

Collins Mills RD over Cobossee Stream

Fair

Kennebec County, Maine · 0.7 MI N of Litchfield RD · Structure no. 3331

Built
1936
89 years old, rebuilt 1961
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
119 ft
3 main spans
Daily traffic
1,512
2016 count
Owner
State
State Highway Agency

About this bridge

Collins Mills RD over Cobossee Stream is a steel stringer/multi-beam or girder carrying Collins Mills RD over Cobossee Stream in Kennebec County, Maine. It was built in 1936 and reconstructed in 1961, so it is 89 years old, older than the Maine average of 53.7 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 1,512 vehicles a day, roughly 5% of them trucks, projected to reach 2,268 by 2036. The structure is 119 ft (36.3 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCollins Mills RD
CrossesCobossee Stream
Location0.7 MI N of Litchfield RD
RouteCity Street 0
StateMaine
Coordinates44.24487, -69.89493
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length119 ft (36.3 m)
Longest span59 ft (18 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,512 (2016)
Projected traffic2,268 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Collins Mills RD over Cobossee Stream built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1961.

What condition is Collins Mills RD over Cobossee Stream 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 June 2024.

How much traffic does Collins Mills RD over Cobossee Stream carry?

About 1,512 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Collins Mills RD over Cobossee Stream?

The structure is 119 ft (36.3 m) long with a longest span of 59 ft (18 m) and a deck 29 ft wide.

Who owns Collins Mills RD over Cobossee Stream?

It is owned by the State Highway Agency.