Height: 52 metres
Width at crest: 675 metres
River's depth beneath Falls: 56 metres
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Height: 55 metres
Width at crest: 320 metres
(The rubble base reduces the uninterrupted fall of water to 21 metres).
Length: 56 km (approx. from Lake Erie to Lake Ontario).
Elevation decline: 99 metres (approx.)
Drainage: 684000 sq. km.
River gorge: 11 km (approx. from the Falls to Queenston downstream).
Depth of gorge: Up to 107 metres.
Total average flow: 6000 cubic metres (estimated).
River speed: Nearly 64 km/hour at crest.
Depth of whirlpool: 38 metres.