Patapsco

[Hollofield gauge was restarted by USGS]. There is no longer a USGS Hollofield gauge. The North Branch of the Patapsco at Cedarhurst USGS gauge http://waterdata.usgs.gov/nwis/uv?01586000 can give you an approximation (it correlates fairly well with the old gauge). I prefer running it at higher levels (above 500 cfs). You should be good to go at 400 cfs and above on the North Branch gauge. Another good indicator is that if there is a wave train just past the Main Street Bridge in Ellicott City, then the Patapsco is running. You need about an inch of rain to get the Oella section at a 'fun' level. It is very flashy, so catch it while you can and scout before you run it.