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These routine and frequent regulations establish operating schedules and notice requirements for drawbridges across navigable waterways. Drawbridge regulations establish the permanent draw operation schedules for bridges and specify what notice mariners must give to request an opening. Short-term deviations from the permanent schedule may be issued for bridge repairs or to test the effectiveness of a proposed new opening schedule. Drawbridge regulations are promulgated by District Commanders, usually at the request of the bridge owner or operator, or of local officials or local Coast Guard bridge administration officials. These routine and frequent rulemakings support the Coast Guard's broad roles and responsibilities of maritime safety and maritime stewardship in relation to the mobility of commercial and recreational vessel traffic. The total actions expected are 200 annually. The Coast Guard also removes or modifies these regulations as needed.