BirdTrout
Vermilion River, Ohio
17.1 mapped river miles, draining 110 square miles, in the Huron Vermilion basin watershed. A USGS gauge stands in it, but its record is too short for a measured July mean, so what this page knows about its temperature is today's reading and Ohio EPA's classification of the water itself.
50°F and colder is cold, through cold-transitional and cool, to warm above 70°F — the same four bands, breaking at 58, 64 and 70°F, that the app paints. Grey is water nobody has measured.
The nearest live reading
The nearest gauge is 13.8 miles away, at Huron River At Milan Oh — not a reading of this water, but of what the region is doing today. A closer gauge has stopped reporting — it has sent no water temperature for 320 days, since 12 November 2025, so no number here comes from it.
Thermal classification
There isn't one. Ohio EPA publishes no temperature classification for any water in Ohio. What it publishes is the aquatic life use below — a habitat designation under Ohio Administrative Code 3745-1, which describes the assemblage the water holds rather than the temperature it runs at — so this river draws grey on the map above, and grey here means unmeasured rather than warm. The only temperature on this page is the live reading from the nearest USGS gauge, 0.0 miles away; it is a reading of that water, not this one.
The lake run
The Vermilion River is a Lake Erie tributary with 23.6 miles of run corridor on it — salmon, steelhead and lake-run brown trout, on their own calendar and under their own rules. Run timing, species and access on the Vermilion River →
Questions about this river
- Vermilion River fishing report — what it reads right now
- Vermilion River fishing regulations — season, size and gear by reach
Ohio EPA classification
Ohio EPA classifies this water as Warmwater Habitat. This is Ohio EPA's description of the aquatic community the water supports, assigned under OAC 3745-1 on fish and macroinvertebrate survey scores. It is not the season and creel rules — those are the ODNR Division of Wildlife's, change yearly, and live with that agency.
Ohio EPA water quality standards, OAC 3745-1 →
Species
Ohio EPA designates this as trout water — Warmwater Habitat — without naming the species. No fish survey or stocking record for this water is in the files this site reads.
Tributaries and watershed
Vermilion River sits in HUC 8 04100012, the Huron Vermilion basin, and drains 110 square miles, Strahler order 5 at the mouth. 113 NHD reaches carry the name for 68.9 miles in total — more than the 17.1 miles of drawn mainstem, because NHD counts side channels and braids as their own reaches.
Other water nearby
The closest 6 rivers on this site, straight-line from the middle of this one — not drive time.