Originally Posted by clintnz
It's a neat trip up here & would be an easy ride with normal lower summer river levels.. . .
Umm, "normal lower summer river levels is a bit of a misnomer. In those parts the spring/early summer snow melt and rains means hydro lake levels are usually very high come the new year so hydro dams spill water down the normally dry river beds hence the water you found. I had to cancel a leg up the side of the Pukaki Riverin 2011 because Pukaki dam was spilling. 2012 had Benmore spilling during the DB as well.
Subject to localised rain, autumn or winter are are probably better times to explore the Tekapo and Pukaki rivers.