By Dan Catchpole, Noah Haglund and Scott North, Herald Writers OSO ??? Before the hillside wiped out Steelhead Drive on Saturday, the people who lived there worried more about flooding from the Stillaguamish River.They weren???t alone.They worked with Snohomish County, the Army Corps of Engineers and other agencies to keep the river from gnawing away at their land.They knew slides were possible ??