Parking is always free, even along the so-called 'fire route', but don't park there--it's best to park on the east side of the road, Commissioner St.. The whole area is used as parking by touring buses, so there is a lot of room. Worst case, after 'public servant' work hours, continue down to the government parking lot just below via Cliff St.
In any case, this facility is there thanks to a lot of work from the Ottawa River Runners, so put 5$ in the metal box down near the water!
Tomorrow (wednesday) is a toss-up: judo training or Pumphouse. Temperature will determine outcome for me! --C.