Daved,
For water, you will have no problems. Most Gorge trails, including Eagle Creek, follow a steep main creek-valley, crossing multiple side streams and often crossing the main creek a few times.
Aside from the water situation, you still need to plan for snow, debris and downed trees to be on the upper portions of the trails, probably starting around 2000 – 2500 feet. Some trails can still be followed without too much trouble, but it is very easy to lose a trail in the Gorge in those conditions. This is one of the frustrating things about the PNW; some trails and roads just aren’t available as early as one hopes they will be! Feel free to PM with your itinerary and I’ll offer any info I can.