BirdTrout

Mahoning River Watershed, Ohio

2,402 miles of mapped stream across 1,140 square miles of drainage in Mahoning, Trumbull, Portage, Columbiana, Stark, Ashtabula counties, in 74 named streams. Ohio designates 18.0 of those miles as trout water, on 4 streams. The 7 mainstem gauges with a July record read between 71.6 and 76.2°F in July.

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Public land — where the bank is open to walk and fish

USGS gauge — live water temperature

Water temperature — the colour of every stream in the basin

58 64 70

50°F and colder is cold, through cold-transitional and cool, to warm above 70°F — the same four bands the app paints. On this map the colour is nothing at all: Ohio EPA publishes no thermal classification, so every stream on this map draws grey. The gauge dots are the one exception and they read live. Grey is every stream here, for the reason above.

The watershed in numbers

HUC8 05030103 in the USGS Watershed Boundary Dataset. Every figure below adds up the river pages in this basin — same records, one basin at a time.

Cold, cool and warm water

Ohio publishes no thermal class. What Ohio EPA publishes is an aquatic life use under OAC 3745-1 — Coldwater, Exceptional Warmwater, Warmwater, Modified Warmwater or Limited Resource Habitat — assigned on fish and macroinvertebrate survey scores. It describes the community the water supports, not the temperature it runs at. It covers 0% of this basin's stream miles (0.0 of 2,402); the rest is untyped and is drawn grey on the map above.

Ohio EPA publishes no thermal classification of any stream in the state, so this page has no cold/cool/warm breakdown and none is inferred from the aquatic life use. The coldwater designation is a habitat and management call — OAC 3745-1-07(B)(1)(f) covers both waters holding native coldwater fauna and waters ODNR runs a trout programme on that could be restored to coldwater — and reading a July temperature out of it would be this site inventing one. Ohio water draws grey on the live map; grey means unmeasured.

Every named stream in the basin

All 74 of them, longest first. None has a page of its own yet; all of them are in the app. The class column is Ohio EPA's designation of that stream. It is not a temperature: this state publishes none, so every row reads untyped in the thermal column. "Now" is the live USGS reading where a gauge stands in that stream.

Public land in the watershed

60,906 acres in 19 units, which is 8.3% of the 729,481 acres the basin covers. Private inholdings carried in the same source file are excluded, here and on the map.

The biggest named blocks of it, each with its own page — the streams on that ground, what is open to hunt on it, and where the access sites are.

• Mosquito Creek Lake 10,649.5 ac
• Mosquito Creek State Park 8,584.6 ac
• Berlin Lake 6,188.6 ac
• West Branch State Park 5,666.2 ac
• Berlin Lake Wildlife Area 5,372.2 ac
• Michael J. Kirwan Reservoir 3,175.0 ac
• Meander Reservoir 2,787.0 ac
• Lake Milton State Park 2,652.9 ac
• Mosquito Creek Wildlife Area 6,563.5 ac
• Mosquito Creek Wildlife Area 2,616.6 ac
• Mosquito Creek Wildlife Area 6,440.3 ac
• Mill Creek Park 2,337.4 ac

Neighbouring watersheds

The subbasins that share a boundary with this one and carry coldwater streams.

• Grand 04110004
• Tuscarawas 05040001
• Upper Ohio 05030101