Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.117.224 Thames River

(a) The draw shall open on signal to 75 feet above mean high water for all vessel traffic unless a full bridge opening to 135.3 feet above mean high water is requested.

(b) The 75 foot opening will be signified by a range light display with one solid green light and one flashing green light and the full 135.3 foot opening will be signified with two solid green range lights.

(c) The draw shall open on signal for public vessels of the United States and commercial vessels;  except that, when a train scheduled to cross the bridge without stopping has passed the Midway, Groton, or New London stations and is in motion toward the bridge, the lift span shall not be opened until the train has crossed the bridge.

(d) The draw shall open on signal as soon as practicable for all other vessel traffic but no later than 20 minutes after the signal to open is given.