Authorities arrested 55 drunken drivers in December in Clay County, Moorhead, Dilworth, Glyndon and Hawley, according to a news release.
The Clay County Sheriff's Office made 19 arrests, with an average alcohol content of 0.12 percent.
Moorhead police made 25 arrests, with an average of 0.15 percent blood alcohol content.
Dilworth police arrested five people with an average 0.15 percent blood alcohol content.
Hawley police made one arrest with a blood alcohol content of 0.09 percent.
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Glyndon police arrested five people with an average 0.13 percent blood alcohol level.
The average alcohol content among of all departments combined was0.14 percent, the release said.