Structure L12001016+04001 · Deer Lodge County, MT

S 569 over French Gulch 042

Carries S 569 over French Gulch 042, 19m SW Anaconda.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT93 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

93 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 tee-beam bridge.

Built201511 years old
Length93.2 ft28.4 m
Daily traffic293counted 2023
Last inspectedJuly 2023every 24 months

Location

StateMontana
CountyDeer Lodge
Location19m SW Anaconda
CarriesS 569
CrossesFrench Gulch 042
Coordinates45.94167, -113.07389

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length93.2 ft (28.4 m)
Max Span89.9 ft (27.4 m)
Deck Width31.2 ft (9.5 m)
Deck Area269.8 sq m
Main Spans1
Year Built2015

Traffic

Avg Daily Traffic293 (2023)
Truck Traffic74%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure NumberL12001016+04001

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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