Portneuf River Vision: staff outline Oxbow restoration, Rainy/Centennial Park wetland project and watershed grants

Planning staff summarized progress under the Portneuf River Vision and current project status, emphasizing ecosystem restoration, access and economic benefits tied to the river corridor.

Becky Bavin and colleagues reminded the council the River Vision (2016) created a multi-agency framework and spawned projects including debris-jam removal, water-trail access points, Russian-olive removal and trail connections. Staff described current grant-funded work: a Portneuf Watershed Partnership cooperative grant ($300,000) to develop a predictive basin model, perform willow plantings and expand watershed restoration planning; a WaterSMART planning grant for Oxbow restoration ($522,500 total with federal $391,875 and the city contributing $130,625 in ARPA funds to reach 60% design); and a WaterSMART EWRP grant to fund the Rainy/Centennial Park levee-setback wetland concept (projected total Centennial project build-out roughly $7 million; the levee/setback wetland element is funded at about $2.1 million including $524,000 ARPA match).

Staff addressed water-quality concerns driving projects: elevated water temperature, high E. coli readings and sedimentation (staff said Marsh Creek and upstream grazing are major contributors and noted the city is working through watershed partnerships). The Oxbow project aims to restore side channels and wetlands to improve riparian habitat and recharge groundwater; design work must account for utilities, railroad constraints, Army Corps permitting (Section 408) and potential aquifer interactions.

Staff requested council guidance on communication priorities and long-range plan updates; council members emphasized realistic public expectations (removing the concrete channel would require congressional action and is effectively a multi-decade prospect) and asked for clearer staging so the public understands which projects are funded and which are concept-level.