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Engineers present Blacksteel drainage plan: 60% design complete, construction estimate about $1.9M
Summary
A JMT presentation outlined a preferred alternative of closed drainage, sidewalks, detention basins and improved outfalls for the Blacksteel community; final design is 60% complete and construction is estimated at $1.9 million with permitting and easement work ahead.
Johnson, Marmon & Thompson (JMT) presented the Blacksteel (also referenced as Blacksmith) Community Drainage Improvements plan to the council and described steps toward final design and permitting.
David Billings, JMT project lead, summarized a multi‑step plan that adds closed drainage on some road segments, stormwater detention, sidewalks and improved outfalls to capture runoff before it reaches homes. He said the team completed a hydraulic evaluation and a 60% design package and recommended moving to final design and permitting. “We’ve completed the hydraulic evaluation, 60% design completed, public engagement completed, and we’ve started the environmental coordination,” Billings said.
Billings told council the project addresses multiple flood‑prone locations identified in the study (5‑ and 10‑year flood areas shown on plan graphics) and that the preferred alternative is intended to capture runoff along roadways and reduce property flooding. He estimated construction at roughly $1.9 million and said JMT expects to propose a ~10% supplement (about $303,800) to complete final plans and permitting.
Council members asked about easements, schedule and impacts on private property; Billings said the team anticipates needing temporary and permanent drainage easements and estimated an 18‑month construction window after final design and permitting, noting permitting review times are outside the city’s control. Council requested the consultant submit the full study and plans to staff for distribution to council prior to action.
What’s next: JMT will submit a formal supplement proposal for final design and permitting costs, staff will confirm easement and acquisition needs and the item will return to council when the final design and cost proposal are ready.
