Backbone ST Pk over Maquoketa River

Fair Condition92 years old

Location

StateIowa
CountyDelaware
LocationIn Backbone State Park
CarriesBackbone ST Pk
CrossesMaquoketa River
Coordinates42.61816, -91.56089

Condition Ratings

Overall ConditionFair
Deck7 (Good)
Superstructure7 (Good)
Substructure6 (Satisfactory)
Channel/Waterway7 (Good)
Scour Critical5 — Stable for scour

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length103.0 ft (31.4 m)
Max Span34.1 ft (10.4 m)
Deck Width22.0 ft (6.7 m)
Deck Area210.4 sq m
Main Spans3
Year Built1934

Traffic

Lanes On Bridge2

Inspection & Ownership

Last Inspection324
Inspection FrequencyEvery 24 months
OwnerState Park/Forest Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Structure Number000000000699030

Nearby Bridges

Backbone ST Pk over Maquoketa River 0.2 mi Good Backbone ST Pk over Stream 0.3 mi Fair Backbone ST Pk over Stream 1.3 mi Fair Loc 110th AVE over Stream 1.6 mi Fair Backbone State Pk over Br Maquoketa River 1.7 mi Fair FM 110 AVE over S Fork Maquoketa River 1.7 mi Fair Loc 130th AVE over Stream 1.7 mi Good Backbone ST Pk over Maquoketa River 1.8 mi Fair Loc 400th ST over Maquoketa River 2.0 mi Good Forestville RD over Stream 2.5 mi Fair