Structure 2801270015800 · Merrimack County, NH

Nh103 over Lake Todd Outlet

Carries Nh103 over Lake Todd Outlet, 0.1 Mi From Newbury Tl.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT70 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

70 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built1967rebuilt 2002
Length69.9 ft21.3 m
Daily traffic4,633counted 2023
Last inspectedApril 2024every 24 months

Location

StateNew Hampshire
CountyMerrimack
Location0.1 Mi From Newbury Tl
CarriesNh103
CrossesLake Todd Outlet
Coordinates43.27399, -71.96673

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length69.9 ft (21.3 m)
Max Span65.9 ft (20.1 m)
Deck Width49.5 ft (15.1 m)
Deck Area321.6 sq m
Main Spans1
Year Built1967 (reconstructed 2002)

Traffic

Avg Daily Traffic4,633 (2023)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number002801270015800

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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