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SECTION 2 - HUMAN ACTIVITIES THAT ALTER STREAM CORRIDORS <br />Roads <br />How Roads Impact Stream Corridors <br />• Channelized and straightened streams <br />• Constricted and narrowed channels <br />• Fragmentation and loss of habitat <br />• Contaminants (such as engine oil, de-icing <br />materials) on roads are important sources of <br />nonpoint pollution <br />• Filling stream corridors to maintain road <br />grade <br />Our roads and highways often closely parallel <br />streams and rivers in Colorado, especially in narrow <br />mountain canyons. Roads traverse rivers in numer- <br />ous locations, requiring construction of bridges. <br />Lessening Our Negative Impact <br />• Where possible, move roads out of stream <br />corridors <br />• When replacing bridges, enlarge the new <br />bridge to allow channel to migrate <br />• Create well-vegetated buffer areas between <br />roads and streams <br />• Install properly sized and located culverts <br />7S <br />C <br />x <br />Q <br />0 <br />a <br />U <br />x <br />2 <br />T <br />T <br />0 <br />0 <br />27 <br />Channel constriction and habitat loss <br />Improperly placed culvert, causing bank erosion <br />and acting as a possible barrier to fish movement. <br />Shoshone National Forest, WY