North Main Canal Drop 1 and Little John Creek Canal Lining Project

The Oakdale Irrigation District (OID) North Main Canal (NMC) Drop 1 structure and concrete canal liner located between Tunnel 1 and the outfall to Little John Creek has reached the end of its useful life and is in need of replacement. To enhance operational efficiency and employee safety, the existing weir structure with board slots is proposed to be replaced with a new long-crested weir structure. Additionally, significant seepage from a 250 LF segment of the NMC is occurring downstream of the Little John Creek Diversion Dam. Placement of a shotcrete overlay on the existing 120 feet of 2” liner and installation of approximately 130 LF of new 4” shotcrete liner with a new concrete invert is proposed. Together, the proposed North Main Canal Drop 1 and Little John Creek Canal Lining Project (Project) will include installation of temporary water diversion measures in the canal; de-watering the canal as necessary; scaling loose rock and vegetation on the canal walls; removing debris from the canal; demolition of the existing drop structure; placement of new shotcrete lining; placement of a new concrete canal floor; and construction of the new long-crested weir structure. The two construction sites are included as one Project due to their close proximity, similar nature, and mobilization timeline. One contract will be executed for construction at both sites. The construction will take place between November 1, 2026 and March 1, 2027 when the canal is dewatered, and all construction will occur within the existing OID 100-foot right-of-way for the facility. Neither the capacity nor service area of the North Main Canal will be increased as a result of the Project. The proposed construction laydown site and staging area will be located in the Project vicinity on privately owned property. Existing graveled access roads and the North Main Canal bank will be used for access by the contractor and all personnel.