Answer: dam

AnswerCrossword Clue
DAMRiver crosser
DAMCurrent checker
DAMSpillway setting
DAMHungry Horse or Hoover
DAMRiver block
DAMIt'll hold water
DAMHydropower source
DAMOne crossing a river
DAMNew Mexico's Elephant Butte, e.g.
DAMRiver-valley construction
DAMFish-ladder site
DAMBlock
DAMProvider of flower power?
DAMDatum on a horse's pedigree papers
DAMHoover, e.g.
DAMLake maker, maybe
DAMBeaver's creation
DAMBeaver's handiwork
DAMObstruct
DAMLake maker
damto stop up
DAMBoulder, e.g.
DAMIt holds water
DAMTVA project
DAMHoover is one
DAMHoover or Norris
DAMIt retains water
DAMReservoir creator
DAMWater container?
DAMWater stopper
DAMBarrier
DAMHoover, for one
DAMHoover or Beaver
DAMMama horse
DAMCurrent blocker
DAMFlow stopper
DAMTVA structure
DAMStop up
DAMFish ladder's locale
DAMBeaver project