EPA Region 1

Stream Condition (IBI)

•	Poor

•	Good

Relative Extent

Relative Risk to
Macroinvertebrate
Integrity (IBI)

Riparian Vegetative Cover

I	1	1	1	1	1	1 I	1	1	1	1

0 5 10 15 20 25 30 0	1	2	3	4

% of Stream Length Relative Risk Ratio
in Poor Condition

-------