Posted by Claiborne | Posted on 05-17-2010
For those of you who have not been following the Cruisers’ Net, or have not cruised through St. Augustine over the past two years, the historic Bridge of Lions has undergone a radical rebuilding. For a time, a temporary bridge was in place to serve automobile traffic, while the older span was being rebuilt. Now, the Bridge of Lions has reopened, and the temporary bridge is being removed.
Below, Captain Bob presents some IMPORTANT information (copied from the MTOA List-Serve) which could easily be interpreted to mean that the new Bridge of Lions incarnation ACTUALLY HAS LESS VERTICAL CLEARANCE THAN WHAT IS LISTED ON THE NOAA CHARTS and in the Federal Registry.
BE SURE TO READ MY SUBSEQUENT COMMENTS ON ADDITIONAL INFORMATION AT THE BOTTOM OF THIS POSTING. VERTICAL CLEARANCE ON THE NEW BRIDGE OF LIONS HAS SUDDENLY BECOME A VERY HOT TOPIC INDEED!
Here was the situation; we were approaching the Bridge of Lions in St Augustine at 7:45AM on 28 April 2010, with a tide level of +4.5′ and a listed bridge clearance at “low iron” of 25’ above Mean High Water (MHW). According to NOAA, the MHW level for the St Augustine City Dock, which is next to the Bridge of Lions is 6.41′ (see NOAA link below). The tops of our VHF antennas were measured at 22’ above the water level. My calculations were:
Charted Bridge Clearance +25′
Plus Mean High Water +6.4′
Minus the Height of Tide -4.5′
Calculated Clearance 26.9′
Simply said, the listed bridge clearance 25′ is measured above MHW, and if the tide was at zero, the actual clearance would be 31.4′ (25′ + 6.4′); but we had a 4.5′ tide so the clearance should be 4.5′ less, or 26.9′ (25′ +6.4′ -4.5′).
Here is what we found as we approached the opening between the old temporary bridge, which is being demolished, and work barges from the north. Sue spotted a temporary tide board below the new bridge with red spray painted numbers indicating the current clearance was 22′ at low iron. We passed under the bridge with less than a foot above our antennas at the center of the bridge. I think the temporary tide board was correct, which would mean the actual clearance is closer to 20’ above MHW, and not 25’.
What am I missing? I contacted the Bridge of Lions and their contractor told
them that when I passed under the bridge the tide was extremely high and thus I
had less than the listed 25’ clearance.
MHW for the St Augustine City Dock:
Bob and Sue Mimlitch
M/V Our Independence
I asked Captain Bob to send me additional info when possible, and received the heartwarming reply below:
I should have said more about the difference between the listed bridge height on the charts and cruising guides, which is clearance at the center; versus the tide board which is clearance at low iron. A few bridges in Florida have signs that specify the number of feet of additional clearance at center.
I love Salty Southeast Cruiser’s Net. Thanks for all your efforts.
As of Monday, 5/17/10, the new Bridge of Lion’s vertical clearance has become a HOT topic! The Cruisers’ Net, Waterway Guide and ActiveCaptain are all in the hunt for information. We thank Waterway Guide editor, Chuck, for the info below. Since we received Chuck’s e-mail (actually a posting on the MTOA list-serve), I have personally spoken with both Captain Jay Bliss, member of the St. Augustine Port Commission, and Ms. Laurie Sanderson with the Bridge of Lion’s rehabilitation project. As Chuck notes below, this question will arise at a meeting tomorrow, and we have everyone’s promise to shoot us the results ASAP!!!! I will post this data the second it’s received, and probably send out a special “Alert” as well!
In the meantime, NOTE THE CONTRACTOR’S ASSERTION IN CHUCK’S NOTE BELOW THAT CRUISERS SHOULD ONLY COUNT ON 22 FEET OF CLOSED VERTICAL CLEARANCE AT HIGH WATER WHEN PASSING UNDER THE NEW BRIDGE OF LIONS!!!!
I have just spoken with Laurie Sanderson from the Bridge of Lions Rehabilitation Project and the bridge clearance is up for discussion at their meeting tomorrow. According to the contractor on site, the MHW clearance for the new bridge is indeed 22′ regardless of what the charts say. We will post more tomorrow after the meeting and more details are known.