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Rosenberg outlines $47.5 million CDBG‑MIT drainage program, construction to begin after federal permits
Summary
City staff and the CDBG‑MIT design team presented status updates on seven flood-mitigation activities funded primarily by a $47.5 million General Land Office grant, including Dry Creek channel improvements, multiple detention ponds, channel lining at Theater Ditch and box culverts to reduce flooding on Avenue Inn and Graber.
City staff and the engineering team presented a detailed update on a multimillion‑dollar flood‑control program funded through the Texas General Land Office’s CDBG‑MIT (Community Development Block Grant — Mitigation) award, describing project scope, permitting progress, design changes and an anticipated construction timeline.
Engineer Steven Wilcox, principal hydraulic engineer (firm name provided in the meeting), said Rosenberg was awarded roughly $47.5 million through the GLO’s mitigation program after Hurricane Harvey and that the city’s design and environmental work is complete. Wilcox said the U.S. Army Corps of Engineers issued an approved jurisdictional determination and related permits in April 2025, clearing a major permitting hurdle.
What the program covers: the package includes seven activities across the city, with major elements described as: - Dry Creek channel improvements from Louisa to State Highway 36, including channel widening/deepening and two new detention ponds (one wet‑bottom pond near George Junior High and one dry‑bottom pond upstream of Louisa/Cambridge Village); - Theater Ditch South channel work and a culvert replacement to improve outfall for low‑lying Avenue Inn neighborhoods; - A roughly 22‑acre dry‑bottom detention pond and associated channel work intended to reduce flooding along Timber Lane and Lane Drive; - Graber/box culvert work to reduce severe ponding at Avenue Inn and to route flows into new detention capacity; - Other channel regrading and spot improvements across older drainage corridors.
Wilcox said the regional basin and detention designs include concrete-lined pilot channels and grassed dry bottoms where feasible to avoid permanent standing water; one pond will include a permanent wet shelf to meet depth and conveyance requirements and to maximize storage. He described tradeoffs driven by construction costs and right‑of‑way limits: some steeper sections will require concrete lining because side slopes cannot be widened without property acquisition.
Costs, timing and city participation: Wilcox confirmed some scope reductions were made to remain within available funding after construction cost increases. The grant covers most construction, but the city has already contributed several million dollars to design, land acquisition and gap funding; staff estimated the city’s extra contribution to date at roughly $3–4 million and said “a couple more” may be necessary. The team is targeting substantial construction activity with a goal to complete work by November 2026, subject to contractor schedules and weather (hurricanes can delay work), Wilcox said.
Traffic and access: several projects will require temporary road closures to replace culverts (examples cited: Avenue Inn, Pecan Park culverts). Wilcox said contractors will provide phased detour plans and the city and school district have been briefed on construction impacts near George Junior High. Councilmembers raised concerns about detours during school pick‑up times and asked staff to notify residents and coordinate phasing.
Flood‑insurance and mapping implications: a councilmember asked whether completed improvements will lower homeowners’ flood insurance premiums. Wilcox said completed infrastructure could support a FEMA Letter of Map Revision (LOMR) to change flood‑plain maps, or be captured when FEMA restudies county maps — both are administratively separate processes that can take years.
Public questions: residents asked about pond appearance, public access and mosquito risk; Wilcox said most ponds are dry‑bottom, grassed and designed to drain after storm events, and that selected ponds include a wet shelf only where required by hydraulic needs. Staff noted GLO grant conditions prohibit adding recreational amenities as part of the federal contract; any future park/dog‑park ideas would require separate city funding and agreements.
End note: staff recommended proceeding to bid phases at the earliest opportunity and agreed to provide residents with a preconstruction schedule once a contractor is selected. Council and residents emphasized communications and detour planning before construction begins.
