There was formerly a realtime USGS gauge near the put-in. It has been gone for years. A stick gauge is or [or was] located in the river at the put in, with color coding. The orange bar is one turbine, the blue bar is two turbines. This gauge has been partly pushed over by the flow, and probably needs to be reset. Use it with caution.
GAUGE UPDATE: Flooding in 2004 washed away the stick gauge. You're on your own until it's replaced. Hint: Look at the power plant to see how many turbines are running, then look at the bypass reach, right of the power house outflow as you look upriver, to judge natural flow. To state the obvious, if it looks like one turbine is running, it's a one-turbine release. If two turbines are running, well, you know...
FLOW UPDATE: A 2008 recreational release schedule for the Mongaup has just been announced. Most releases are one turbine (870 cfs), or Class II+, but FERC now requires that the schedule include some two-turbine releases (1640 cfs) or Class III-. Paddlers are encouraged to call Alliance Energy's release hotline (845-786-8012) after Wednesday on release week and again before leaving home on release day to verify release volume.
Of course, the river does release frequently during the week for power generation Release volumes for power releases are not specified or announced; During drought conditions, the Delaware River Basin Commission has the authority to suspend recreational releases, though unscheduled power releases still occur.