US Bridges

Lower Detroit RD over Martin Stream

Fair

Penobscot County, Maine · 0.2 MI NW JCT RTE 7 · Structure no. 2982

Built
1933
92 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
122 ft
3 main spans
Daily traffic
751
2016 count
Owner
State
State Highway Agency

About this bridge

Lower Detroit RD over Martin Stream is a steel stringer/multi-beam or girder carrying Lower Detroit RD over Martin Stream in Penobscot County, Maine. It was built in 1933, so it is 92 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 751 vehicles a day, roughly 5% of them trucks, projected to reach 1,202 by 2036. The structure is 122 ft (37.2 m) long and 24 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesLower Detroit RD
CrossesMartin Stream
Location0.2 MI NW JCT RTE 7
RouteCounty Highway 69
CountyPenobscot County
StateMaine
Coordinates44.76932, -69.21416
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionAugust 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 rating50.7 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length122 ft (37.2 m)
Longest span64 ft (19.4 m)
Deck width24 ft (7.4 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic751 (2016)
Projected traffic1,202 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lower Detroit RD over Martin Stream built?

It was built in 1933, making it 92 years old in 2025.

What condition is Lower Detroit RD over Martin 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 August 2024.

How much traffic does Lower Detroit RD over Martin Stream carry?

About 751 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Lower Detroit RD over Martin Stream?

The structure is 122 ft (37.2 m) long with a longest span of 64 ft (19.4 m) and a deck 24 ft wide.

Who owns Lower Detroit RD over Martin Stream?

It is owned by the State Highway Agency.