Kings Bridge Deck Replacement ( OFFICE FILE 1863 . 0 )

2026-11-03

2 . 1 Demolition and Removal The Contractor shall : 1 . Remove existing timber decking planks along the full bridge length . 2 . Remove and dispose of existing edge boards / curbs ( rim boards ) on both sides of the deck . 3 . Remove and dispose of all existing curb fasteners (“ side pins ”) located along deck edges . • Approximately 124 pins present on the narrower section • Existing pins are approximately 1 ” diameter with an estimated length of 16 ” 4 . Carefully remove existing railing systems for later reinstallation . • If necessary , the railing along the narrower section may be cut into large sections to facilitate decking removal and replacement . • Upon completion of decking installation cut sections shall be properly sleeved and welded to restore structural continuity 5 . Dispose of all demolition waste in accordance with local regulations . 2 . 2 Additional Site Work ( As Required ) Cut - back or removal of asphalt at either end of the bridge may be necessary to ensure a smooth transition between bridge and trail . This work is not included in the Contractor ’ s base bid and shall only be performed upon written authorization by the City of Great Falls . 3 . MATERIALS 3 . 1 Deck Planks • Pressure - treated structural lumber , # 2 Southern Yellow Pine or approved equivalent . • Minimum preservative treatment : AWPA UC4B ( exterior structural , ground - contact ). • Thickness requirements o Approximately 7 ” thickness for narrower section o Approximately 12 ” thickness on wider section • Moisture content at installation : 19 % or less . • Lumber shall be free of excessive warping , splitting , or defects that would impair performance or pedestrian safety . 3 . 2 Edge Boards / Rim Boards Edge boards or curbs shall be replaced in - kind , consistent with existing bridge construction . • Timber bridge span : Replace existing timber curb / rim boards with new pressure - treated lumber of similar size , orientation , and configuration . • Steel bridge span : Existing edge boards appear to be installed flatwise and notched around steel girders . Replacement shall match existing size , orientation , notching , and attachment method unless otherwise directed by the City .

Montana

2026-04-29