US Bridges

Frog Aly over Old Course of Saco River

FairPosted for load

Oxford County, Maine · 3 MI N JCT RTE US 302 · Structure no. 1004

Built
1857
168 years old, rebuilt 1987
Condition
Fair
inspected October 2024
Type
Truss - Thru
Other
Length
133 ft
1 main span
Daily traffic
50
2016 count
Owner
State
State Highway Agency

About this bridge

Frog Aly over Old Course of Saco River is a other truss - thru carrying Frog Aly over Old Course of Saco River in Oxford County, Maine. It was built in 1857 and reconstructed in 1987, so it is 168 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 5% of them trucks, projected to reach 80 by 2036. The structure is 133 ft (40.6 m) long and 16 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesFrog Aly
CrossesOld Course of Saco River
Location3 MI N JCT RTE US 302
RouteCity Street 0
StateMaine
Coordinates44.07952, -70.90309
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
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 inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating8.9 US tons
Inventory rating6.8 US tons

Structure

Structure typeTruss - Thru
MaterialOther
DeckWood or timber
Main spans1
Design loadH 15
Structure length133 ft (40.6 m)
Longest span115 ft (35.1 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deck8 ft (2.6 m)

Traffic and service

Average daily traffic50 (2016)
Projected traffic80 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

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

Frequently asked questions

When was Frog Aly over Old Course of Saco River built?

It was built in 1857, making it 168 years old in 2025. It was reconstructed in 1987.

What condition is Frog Aly over Old Course of Saco River 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 October 2024.

How much traffic does Frog Aly over Old Course of Saco River carry?

About 50 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Frog Aly over Old Course of Saco River?

The structure is 133 ft (40.6 m) long with a longest span of 115 ft (35.1 m) and a deck 16 ft wide.

Who owns Frog Aly over Old Course of Saco River?

It is owned by the State Highway Agency.