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Illinois River watershed briefing warns of rising streambank erosion and gaps in post‑construction stormwater oversight
Summary
Illinois River Watershed Partnership reported widespread streambank erosion in NW Arkansas—assessing 983 banks (249 miles) with an average modeled retreat of ~5.2 ft/yr and estimated phosphorus loading ~56,000 lb/yr—while DEQ staff told legislators that long‑term stormwater detention responsibility typically rests with local municipalities after construction permits end.
Nicole Hardiman, executive director of the Illinois River Watershed Partnership, told the Agriculture Committee that rapid urbanization in Northwest Arkansas and land‑use change have increased high‑flow events and streambank erosion across the Illinois River watershed.
Hardiman summarized a 2017 stream‑bank erosion assessment covering 983 banks (about 249 miles) and reported a model estimate of average erosion at roughly 5.2 feet per year in the study area. She said the study‑area sediment loading was just over 37,000 tons per year and estimated…
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