Structure 11106000000097 · Gallatin County, MT

Line Creek Road over Stormcastle Creek

Carries Line Creek Road over Stormcastle Creek, Off Sq___ Creek Road.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT31 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 7/9Substructure 5/9 · sets the rating

31 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.

Built1948rebuilt 1975
Length30.5 ft9.3 m
Daily traffic50counted 1993
Last inspectedSeptember 2023every 24 months

Location

StateMontana
CountyGallatin
LocationOff Sq___ Creek Road
CarriesLine Creek Road
CrossesStormcastle Creek
Coordinates45.42306, -111.12001

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length30.5 ft (9.3 m)
Max Span28.9 ft (8.8 m)
Deck Width15.4 ft (4.7 m)
Deck Area43.7 sq m
Main Spans1
Year Built1948 (reconstructed 1975)

Traffic

Avg Daily Traffic50 (1993)
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical4 — Foundations need monitoring
Structure Number011106000000097

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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