US Bridges

S Union RD over Brown Brook

Fair

Knox County, Maine · 1 MI N Townline · Structure no. 5763

Built
1959
66 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete
Length
53 ft
2 main spans
Daily traffic
2,108
2016 count
Owner
State
State Highway Agency

About this bridge

S Union RD over Brown Brook is a concrete slab carrying S Union RD over Brown Brook in Knox County, Maine. It was built in 1959, so it is 66 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 2,108 vehicles a day, roughly 5% of them trucks, projected to reach 2,951 by 2036. The structure is 53 ft (16.2 m) long and 32 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesS Union RD
CrossesBrown Brook
Location1 MI N Townline
RouteCounty Highway 131
CountyKnox County
StateMaine
Coordinates44.19748, -69.26344
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55.3 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length53 ft (16.2 m)
Longest span24 ft (7.3 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,108 (2016)
Projected traffic2,951 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed19.3 mi (31 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 S Union RD over Brown Brook built?

It was built in 1959, making it 66 years old in 2025.

What condition is S Union RD over Brown 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 July 2024.

How much traffic does S Union RD over Brown Brook carry?

About 2,108 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is S Union RD over Brown Brook?

The structure is 53 ft (16.2 m) long with a longest span of 24 ft (7.3 m) and a deck 32 ft wide.

Who owns S Union RD over Brown Brook?

It is owned by the State Highway Agency.