From a systems perspective, spillways are part of what constitutes 'the dam.' Systems perspectives form the basis for life-safety decisions. The definition of 'is' in 'What is a dam' might make for interesting legal arguments, but the spillway and the bedrock and the water are all part of the operational definition of a dam.
$ echo 'Oroville Dam: Photos reveal extensive damage as operators stop flow down spillway' | wc -m
82
Something had to be left out to meet the 80 character limit for submission titles. (82 is 81 + null). Omitting the subordinate clause seems not unreasonable to me. YMMV.
The dam is undamaged, as far as we know.