B09_Amend_0002_Att_100__Drawings_Stamped_YELL_338223_0002.pdf

This document is a comprehensive set of construction drawings for bridge preservation work at three locations within Yellowstone National Park: Lava Creek Bridge (1570-022P), Thumb Creek Bridge (1570-029P), and Unnamed Creek Bridge (1570-030P). The project is dated 09/18/2026 and prepared by the National Park Service Denver Service Center under the Department of Interior.

The construction work encompasses detailed repair and preservation activities across all three bridges, including concrete spall repairs, bridge deck and overhang repairs, curb restoration, expansion joint replacement, erosion control installation, riprap and scour protection placement, culvert cleaning, railing restoration and repainting, asphalt overlay work at bridge approaches, and temporary traffic control measures. Specific work items include removing and replacing deteriorated concrete at various locations, installing galvanic anode protection systems, performing hydro-demolition and modified concrete overlays, placing void-filled riprap for bank stabilization, installing class IV riprap for scour protection, restriping bridge centerlines and edge markings, and conducting environmental controls for wetland protection and stream management. The project includes detailed erosion and sediment control plans with designated staging areas, equipment access routes, and limits of disturbance. Construction traffic control requirements specify temporary signage, barrier placement, single-lane closures with signals, and flagging operations. The drawings provide specifications for paint colors (federal standard AMS-STD-595A-20062), material specifications for riprap and concrete, and detailed technical notes addressing contractor methods, temporary stream diversions, environmental protections, and coordination requirements with the park and utility providers.