Crosswordiee.com

% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for River obstruction. 4 letters:

SNAG: River obstruction.
BEAVERDAMS: River obstructions
ICEJAM: Winter river obstruction
DAMUP: Obstruct a river
DAMUP: Obstruct, as a river