US Bridges

Union ST over Griffin Brook

Fair

Penobscot County, Maine · 0.2 MI SE of Griffin RD · Structure no. 5423

Built
1956
69 years old, rebuilt 1964
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
32 ft
2 main spans
Daily traffic
16,810
2016 count
Owner
State
State Highway Agency

About this bridge

Union ST over Griffin Brook is a concrete culvert carrying Union ST over Griffin Brook in Penobscot County, Maine. It was built in 1956 and reconstructed in 1964, so it is 69 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 6 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 16,810 vehicles a day, roughly 5% of them trucks, projected to reach 23,534 by 2036. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 60.3 mi (97 km).

Location

Open in Google Maps
CarriesUnion ST
CrossesGriffin Brook
Location0.2 MI SE of Griffin RD
RouteState Highway 222
CountyPenobscot County
StateMaine
Coordinates44.81761, -68.81142
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.2 US tons
Inventory rating17.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length32 ft (9.8 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,810 (2016)
Projected traffic23,534 by 2036
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 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 Union ST over Griffin Brook built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1964.

What condition is Union ST over Griffin 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 September 2024.

How much traffic does Union ST over Griffin Brook carry?

About 16,810 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Union ST over Griffin Brook?

The structure is 32 ft (9.8 m) long with a longest span of 14 ft (4.3 m).

Who owns Union ST over Griffin Brook?

It is owned by the State Highway Agency.