Structure L25003011+00001 · Lewis and Clark County, MT

Craig Frontage RD over Missouri River 054

Carries Craig Frontage RD over Missouri River 054, 2m NE Wolf Creek.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck5/9 · Fair
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT507 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

507 ft end to end, longest span 180 ft: about 7 semi-trucks nose to tail. Lengths and the semi-truck 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 through truss.

Built193393 years old
Length506.9 ft154.5 m
Daily traffic484counted 2023
Last inspectedJuly 2024every 24 months

Location

StateMontana
CountyLewis and Clark
Location2m NE Wolf Creek
CarriesCraig Frontage RD
CrossesMissouri River 054
Coordinates47.01892, -112.01220

Physical Characteristics

MaterialSteel Continuous
DesignTruss - Thru
Total Length506.9 ft (154.5 m)
Max Span180.1 ft (54.9 m)
Deck Width21.3 ft (6.5 m)
Deck Area1004.2 sq m
Main Spans3
Year Built1933

Traffic

Avg Daily Traffic484 (2023)
Truck Traffic1%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour Critical5 — Stable for scour
Structure NumberL25003011+00001

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.

Nearby Bridges