lock-gates

The creaking lock-gates opened slowly, and the light boat passed in as soon as there was room enough, and the creaking lock-gates closed upon it, and it floated low down in the dock between the two sets of gates, until the water should rise and the second gates should open and let it out.

Our Mutual Friend 2004

The voice of the falling water, like the voices of the sea and the wind, were as an outer memory to a contemplative listener; but not particularly so to Mr Riderhood, who sat on one of the blunt wooden levers of his lock-gates, dozing.

Our Mutual Friend 2004

Such fidgety strife to be first to the front when the lock-gates sever.

Punch, or the London Charivari, Volume 100, May 23, 1891 Various

Nothing gave Philip and Emily more pleasure than to help their father open the lock-gates.

Littlebourne Lock F. Bayford Harrison

Closed iron caissons, termed ship-caissons, and sliding or rolling caissons, are generally employed for closing graving-docks, especially the former (so called from their resemblance in shape to a vessel) on account of their simplicity, being readily floated into and out of position; whilst sliding caissons are sometimes used instead of lock-gates at docks, but require a chamber at the side to receive them when drawn back.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various

They liked going to school, and they liked playing with their friends, but opening the lock-gates, and then watching them as they closed, was more delightful than any other kind of work or play.

Littlebourne Lock F. Bayford Harrison

It would be ruined in a day -- the immense lock-gates would be destroyed.

Tom Swift and His Giant Cannon, or, the Longest Shots on Record Victor [pseud.] Appleton

Grumbling and fumbling, Rowles at length got Roberts across the lock-gates and put the line into his hands, telling him to look out for barges and rapids; and then the stranger set off on his return journey, and Rowles went into his house to tell his wife that he thought they were a stupider lot this summer than ever they had been before.

Littlebourne Lock F. Bayford Harrison

“Mrs. Cockerton may have spotted someone crossing the lock-gates when she walked along the towing-path,” Keith suggested.

The Rising of the Moon Mitchell, Gladys 1945

This answer appeared to satisfy him, for he said no more, and we crossed the lock-gates, glad, for more than one reason, of the brilliance of the moonlight, and took a little path on the further side.

The Rising of the Moon Mitchell, Gladys 1945