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Lyon County adopts Gold Canyon drainage master plan to target flood and sediment risks
Summary
The county commission accepted a FEMA‑partnered Gold Canyon Area Drainage Master Plan after a technical presentation; the plan identifies priority projects, sediment-management concerns and potential funding paths including FEMA grants and NDOT cost-sharing.
Lyon County commissioners voted June 18 to accept the Gold Canyon Area Drainage Master Plan, a watershed-scale study that models flood risk and sediment transport across the Gold Canyon watershed and recommends priority projects for design and construction.
Mike Kellogg of Juller Hydrology and Geomorphology, the study consultant, told the board the project — funded through a FEMA technical-partner grant and coordinated with the Carson Water Subconservancy District and Story County — produced high‑resolution hydrologic and hydraulic models for the 25‑ and 100‑year storms, sediment-transport analyses and an initial list of candidate mitigation projects. The study narrowed 10 identified problem areas to six for further study and advanced three projects into detailed design and cost‑estimate development, including a priority location at the SR 341/342 intersection where overtopping currently makes the roadway impassable during large storms.
Kellogg and commissioners emphasized sediment-clogging of culverts as a recurring operational problem in the steep watershed. The consultant described design options including larger culverts, paired culverts, raised wing walls to create temporary ponding, and sediment/debris ramps to reduce woody-debris clogging; he said many solutions will require ongoing county or NDOT maintenance and regular debris clearing.
Public commenters and board members noted that prior soil surveys and local historic conditions constrain some development options; Kellogg said the study team calibrated models to local flood reports and resident-supplied photos and videos. The plan includes conceptual designs, estimated construction and 20‑year maintenance costs for the priority projects, and a list of potential grant sources (many FEMA programs) and partners (NDOT, CWSD).
The board accepted the study and recommended the county include the projects in future capital-improvement planning and pursue applicable grant funding. Motion to accept the plan passed 5-0.
