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Herrin Reservoir Water Details - IL
Herrin Reservoir is a reservoir in Williamson County, IL. Use this named-water page to check the map, current conditions, and nearby water-quality monitoring; confirm public access, regulations, advisories, and fishability with local sources before fishing.
This named-water page is not a claim that fishing is legal, safe, or productive here. Check public access, local regulations, fish-consumption advisories, and posted closures before fishing.
© OpenStreetMap contributors · open Herrin Reservoir in OpenStreetMap or use coordinates 37.76288, -89.03159.
Current conditions & 3-day forecast
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Weather by Open-Meteo.
Water temperature & water-quality monitoring
Check the official EPA assessment (impaired-waters status and fish-consumption advisories) for Herrin Reservoir at How’s My Waterway (EPA).
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Monitoring summaries from the Water Quality Portal.
State fishing records
Official IL state-record fish are published by the Illinois DNR (iFishIllinois) — records there are the state's, not a MonsterRodHolders list.
Location facts
| County | Williamson |
|---|---|
| Water type | reservoir |