Coast Guard Station Grays Harbor received a distress call from a good Samaritan that said a boat with four people aboard had run aground on the south jetty.
The four people were wearing lifejackets and had no visible injuries.
Crewmembers launched a life boat and a ground crew to the scene, while a Jayhawk helicopter was also sent from Astoria.
Three of the four boaters were able to walk the jetty to shore while the fourth was hoisted aboard the helicopter and taken to Station Grays Harbor where local emergency medical support was waiting.
Crewmembers were able to pull the boat off the jetty and tow it to shore.
There was no report of pollution.