Tollgate Weir

The tollgate weir tells the story of the water in the west –its lean years, its banner years, its flood year, and rain on snow years. Tollgate weir spans a wide range of streamflow over its 50 plus years and integrates the water from the upper portion of the catchment. Studies over the years have shown that 85% of water that comes through this weir comes from only 15% of the watershed, the snow dominated headwater areas. Suspended sediment has also been documented at this and 9 other weirs. Above this weir, relatively little water is diverted to irrigation or other management. The weir was replaced in 1965 following the 1964 flood event.