Loads 
 
Dead Load
  • Dead load is defined as the weight of the entire dock structure including all permanent attachments such as bumpers, dock boxes, winch stands, roof structures, etc.
  • Under dead load, the distance from the top of the water to the bottom of the structural frame shall be a minimum of 7 inches. Any additions or modifications, where the pre-existing structure has less than 7 inches of freeboard, will not be permitted unless the noncompliant structure is brought up to the 7 inch minimum or the modification/addition meets or exceeds the 7 inch minimum.
  • Outer ends of finger or slip walkways shall be level or within 3 inches of the center walkway or dock to which it is attached.
  • Actual dead load freeboard shall be within plus or minus 2 inches of the dead load freeboard shown on the drawings.
  • At the outer ends of finger piers, there shall be less than 3/8 inch difference in freeboard between the outer corners per 3 feet of width.
     
Vertical Live Load
  • Deck live loading for flotation calculations on uncovered docks shall be 20 pounds per square foot (psf). Decks shall also be designed to carry a minimum 400-pound concentrated load on any 1 square foot (sq. ft.). These two loads need not occur simultaneously
  • Roof live load for flotation and structural calculations on covered docks shall be a minimum of 11.5 psf unreduced. Flotation shall carry the full dead load of docks and roof and the roof live load.
  • The outer ends of fingers shall not lose more than 4 inches of freeboard under a concentrated load of 400 pounds placed 2 feet from the end of the finger.

Horizontal Live Load
  • Docks shall be able to withstand a minimum of one-foot high wave action. The specific site may warrant a larger wave loading as specified by a Registered Professional Engineer or Ameren Missouri.
  • Docks, roofs, anchorage, and connections shall be designed to resist the loading from a wind with 77 miles per hour (mph) design basic wind speed (using the projected area method, this wind loading is approximately 15 psf in any direction).
  • In lieu of more precise analysis, the projected area for wind loads shall be defined by the product of the distance between the extreme outer corners of the dock system and the average boat height for the entire dock system. The exposed area shall carry 100% of the projected load and an additional 15% for each hidden boat.
  • Finger piers shall be designed to withstand an impact from the average boat expected to use the slip striking the end of the finger at 10 degrees off center line moving at a speed of 2 mph (approximately 3 feet per second).
     
Access Structures (Bridges/Ramps)
Access structures shall be designed to carry dead and live loads. Minimum live loads shall be 30 psf on the deck.
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