Onondaga County Shuts Down Every Waterway. Here Is Why, and What It Means for Your Property.

By Jen Okafor | CNY Signal

Every waterway in Onondaga County is closed.

County Executive Ryan McMahon signed an emergency executive order on April 8, 2026, shutting down all county waterways after days of heavy rain pushed water levels to dangerous highs. The county is coordinating enforcement with Sheriff Toby Shelley and the canal corporation.

The waterway closure runs through at least Monday, April 13. The broader emergency proclamation remains in effect through May 8 unless rescinded earlier. This is the first time in approximately a decade that the county has taken this step, according to a county spokesperson.

The closure is not precautionary. It is a response to conditions that are actively threatening lives and property.

Three Reasons the County Pulled the Trigger

Officials cited three specific hazards driving the emergency order:

First, submerged debris. Floodwaters have swept logs, branches, and heavy materials into channels and lakes. These objects are partially or fully hidden below the surface, making waterways navigable in appearance but lethal in practice. A boat hitting a submerged log at speed can capsize in seconds.

Second, dangerous currents. Floodwater creates strong, unpredictable currents that overwhelm even experienced boaters. The volume of water moving through county waterways right now is well beyond normal seasonal levels.

Third, shoreline infrastructure damage. Elevated water levels put private docks, retaining walls, and residential properties at risk of severe erosion and structural damage. Water displacement from boat wakes — even at low speed — can accelerate the destruction of already-stressed shoreline infrastructure.

Where the Flooding Is Worst

Oneida Lake, the largest lake entirely within New York state, was specifically cited in the emergency order. Areas near waterways and lakes throughout the county have experienced flooding in the days leading up to the order.

NOAA’s Onondaga Lake gauge at Liverpool provides real-time water level data for residents monitoring conditions near that watershed.

By The Numbers

• April 8 — Date McMahon signed the emergency executive order
• April 13 — Waterway closure remains in effect through at least this date
• May 8 — Emergency proclamation expiration (unless rescinded earlier)
• ~10 years — Since the county last issued a comparable waterway closure
• 315-435-2525 — Onondaga County Emergency Management contact

What You Should Do

If you own waterfront property: Inspect your dock, retaining wall, and shoreline for erosion damage. Document everything with photos for insurance purposes. Do not attempt to make repairs while water levels remain elevated.

If you are a boater: Stay off the water. The order carries enforcement authority. No exceptions for kayaks, canoes, or paddleboards.

If you live near a creek or low-lying area: Monitor water levels. Have a plan if water approaches your foundation. Onondaga County Emergency Management can be reached at 315-435-2525.

The emergency order remains in effect. Check Onondaga County’s official channels for updates on when waterways will reopen.