Cuyahoga AOC delisting measurements and status

"Delisting" is how we refer to restoring Beneficial Use Impairments (BUIs) in the Cuyahoga River RAP Area of Concern (AOC) to target levels, so that they can be removed from the list of impairments and so that eventually the AOC can be removed from the USEPA's list of degraded waterways.

The Beneficial Use Impairments have been set by the Great Lakes Water Quality Agreement (GLWQA) and the targets are set by Ohio EPA using state regulations, policies or guidance. The Cuyahoga AOC had an additional locally-identified impairment, Public Access, which reached its goals and has since been removed.

To see the attainment status by either BUI or subwatershed, go to the appropriate page by hovering over one of the menus below and clicking on the item.

The interactive map below shows the current conditions at each sampling / monitoring site. Only Level 3 credible data is included to insure the quality and standardization of the information.


Click the 'Visible layers' button to choose which biological criteria to view. In some cases, one measure will hide others, so you may wish to uncheck all but the layer you want most to see.

Zoom in to see more landforms and geographic information (roads, etc.) Click and drag to move the map around.

Clicking on the square with two diagonal arrows delivers a full-screen view. Choose "allow" when asked.
Click ESC (escape) to return to the page view.

Hover over a subwatershed to see its Hydrologic Unit name.

Point to a dot to see a short identifier. Click on the dot to see more information about that site data.

Note: If you have trouble with the map or questions about the data, contact us at

The map on the right shows where ICI (benthos) sampling has been completed (green dots) and where
new sampling will take place (red dots.)


The map on the right shows new monitoring sites (red dots) where IBI sampling for fish population is needed and is expected to be completed soon.


The following measures for evaluating the biological criteria, and the evaluation indices for each, are used to set the goals for delisting.

To gauge how close we are to meeting the delisting target for a given impairment, we collect the scores for the applicable index and compare them
to the target scores.

QHEI: Qualitative Habitat Evaluation Index - scores a variety of physical conditions in a stream segment, such as bed material, bank erosion, pools and riffles, cover and shape of the stream to evaluate habitat.

IBI: Index of Biotic Integrity - uses a dozen metrics to measure the number of fish in a sample, the species diversity, pollution tolerance, and other factors to evaluate fish populations.

ICI: Invertebrate Community Index - uses ten metrics to measure the health of insects and non-insect invertebrates in the stream to evaluate benthos (life in the stream bed.)

MIwb: Modified Index of well being measures the numbers, biomass and diversity of species but excludes pollution tolerant species that could survive anywhere, to give a better evaluation of fish populations of species that need higher water and stream quality.


This product or publication was financed in part or totally through a grant from the Ohio Environmental Protection Agency and the United States Environmental Protection Agency, with funds from the Great Lakes Restoration Initiative. The contents and views, including any opinions, findings, or conclusions or recommendations, contained in this product or publication are those of the authors and have not been subject to any U.S. EPA or Ohio EPA peer or administrative review and may not necessarily reflect the views of either Agency, and no official endorsement should be inferred.

 Cuyahoga River Restoration
formerly Cuyahoga River Community Planning

is the local 501c3 facilitating organization that raises funds, manages programs and projects, including this website, and coordinates, staffs, and assists the Advisory Committee.

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