Consultants report encouraging early findings for Causeway Marine Park; permitting expected to take 18–24 months

Consultants for the proposed South Padre Island Causeway Marine Park told the Economic Development Corporation on Sept. 16 that initial field surveys and numerical modeling have produced encouraging results but that permitting will be a long, technical process.

Edgewater Resources co-founder Greg Weicamp and environmental lead Phil (surname not stated) presented six weeks of preliminary engineering, drone and ground surveys, seagrass and oyster mapping, and hydrodynamic modeling. "It's about really solving access to the water for everybody," Weicamp said, describing the project's public-access goals as well as marina functions.

Key early findings and technical points: - Seagrass and oysters: the team ran transect surveys and mapped about 30 acres of seagrass meadows in the study area. Surveyors found the existing channel clear of seagrass and oysters; as Phil reported, "I am happy to report there are not" (seagrasses inside the channel), which reduces expected environmental impacts within the channel. - Channel geometry: the existing natural channel narrows to about 150 feet at its tightest point; consultants said that width should provide room for a central pier with boat slips on either side and safe vessel navigation under preliminary designs. - Survey methods: the team combined drone imagery (taken at low tide to expose seagrass beds), lidar, bathymetry and ground surveys to produce an accurate coastal baseline. The consultants said they extended the surveyed area from the causeway to the KOA campground to collect data that may be useful later. - Engineering and modeling: hydrodynamic and sediment-transport modeling is underway to test design shapes and to avoid creating persistent dredging needs. The project team said they can reuse and tune some modeling from earlier work on a different site and will refine breakwater and habitat-island shapes based on the model results. - Habitat and mitigation strategy: the concept includes constructed habitat islands (rock and engineered substrate) intended to encourage oyster, seagrass and bird/mangrove habitat; the team cited Fort Pierce (Florida) as an example where constructed islands have been colonized by oysters and mangroves over several years. - Permitting timeline: consultants said they plan to submit a joint permit application (U.S. Army Corps of Engineers and State of Texas) in spring next year. They cautioned that review times have lengthened and estimated the permitting process could take 18–24 months or longer depending on required follow-up studies and regulator staffing.

Regulatory scope and uncertainties: presenters stressed the need to "avoid, minimize, then mitigate" impacts, noting dredge impacts and fill impacts would be treated differently. They said seagrass impacts are the most difficult to mitigate; the preliminary mapping suggests relatively few seagrass impacts but some fill impacts are likely and regulators may require in-kind mitigation or accept the out-of-kind habitat-island approach on a case-by-case basis.

Next steps: the team will collect one more round of bathymetry, continue hydrodynamic and sediment-transport modeling, and prepare permit materials. Presenters recommended visiting Fort Pierce mitigation sites and noted mitigation acceptance often depends on individual regulator interpretation.

Ending: EDC members thanked the consultants for the update and did not take formal action on the marina item; staff and the consultants will continue preliminary engineering and advance permit-ready studies.