To monitor the abundance and distribution of nest sites and determine the population status of bald eagles and ospreys breeding adjacent to the Williston and Dinosaur Reservoirs, and to monitor the attrition rate of snags (osprey nesting sites) that were created by reservoir inundation in the 1970s.

Reservoir inundation zones and adjacent foreshore areas around the perimeter of the Williston and Dinosaur Reservoirs.

Preliminary helicopter surveys were conducted in 1995 to identify the availability of nest sites prior to breeding, the abundance and distribution of breeding pairs, and the timing of egg clutches and fledgling dispersal for both bald eagles and ospreys. In 1997, helicopter surveys were conducted to identify available nest sites (March), nest occupancy and clutch sizes (eagles in May, ospreys in June), and fledgling success (eagles in July, ospreys in August). In that year, the study area also included large lakes and rivers in the Williston Reservoir watershed. In 2002, nest-site, nest occupancy/clutch size, and fledgling surveys were conducted for only ospreys along the Parsnip and Finlay Reaches.

Ongoing, 5-year survey intervals (for ospreys along the Parsnip and Finlay Reaches only)

• Eagle/Osprey Nest Locations 1995 (PDF 372KB)
• Eagle/Osprey Surveys 1995 (PDF 175KB)
• Eagle/Osprey Surveys 1997 (PDF 943KB)
• Osprey Survey 2002 (PDF 584KB)