ST. PAUL, Minn. (AP) -

A new report says rivers in southwestern Minnesota are in bad shape because of increased erosion and runoff.

The Minnesota Pollution Control Agency report also says half the rivers and streams tested throughout the state have been altered in recent years, the result of measures taken to help improve drainage for both agriculture and city development.

MPCA spokesman Steve Mikkelson tells Minnesota Public Radio the agency will use the data to help with watershed restoration projects, and to prevent some streams and rivers from becoming worse.

The report takes data from multiple statewide surveys. Mikkelson says the report will act as a baseline when the MPCA does another survey next year.