Dewdney Trunk Road, Mission. Take the Lougheed Highway (Scenic 7) to 287th Street in Maple Ridge. Turn north and follow 287th to Dewdney Trunk Road. Turn right and follow Dewdney Trunk until just before reaching the Stave Falls Dam. Turn right and head down the driveway to access the Hayward Lake Reservoir Recreation Area. Open: Dawn to Dusk. Picnicking area at Hayward Lake. Click the image for a larger view. Photograph courtesy Maurice Jassak. Hydroelectric developments were instrumental in shaping the history and landscape of the Stave Valley from as early as 1909 when the Western Canada Power Company Limited began the construction of a power plant at Stave Falls. In 1929, construction began on Ruskin Dam and Powerhouse at the narrow granite gorge 5.6 km downstream of Stave Falls. Play areas, Gazebo picnic shelter, Car-top boat reservoir access ramp, developed beach, Wheelchair accessible facilities, Washroom facility (change rooms and beach shower), Fishing, Hiking and mountain biking trails and Information displays. The 10 km Reservoir Trail connects with the 6 km Railway Trail to provide a scenic 16 km walk around Hayward Lake Reservoir. The Railway Trail, on the west side of the reservoir, was built to accommodate both hiking and biking. The Reservoir Trail on the east side is restricted to hiking only