FORT ST. JOHN - The scale of the John Horgan Dam, the most costly engineering project in British Columbia history, is hard to fathom until up close.

The crest of the dam is more than one kilometre long. The six enormous pipes that channel water from the dam reservoir to power-generating turbines are each 11 metres in diameter. The powerhouse, spillway and dam buttress, or foundations, involve a total of two million cubic metres of roller-compacted concrete.