We had over 15′ of tide in Bahia Edwards- This photo was taken at mid tide. The bay was even smaller at low tide
Chiloe and its maze of islands is home to big tidal swings. As the tide comes in, it floods simultaneously around both the northern and southern end of Chiloe.
Low tide in Bahia Edwards
One result is big changes in depth where the two streams come together. During spring tides, there can be as much as 20′ (6m) difference between low and high water.
Check out this kelp blanket Angie discovered at low tide. Mike didn’t let her bring it back to the boat
Since we deploy anchor chain according to the depth of the water, it’s important to keep in mind how the depth is going to change throughout the tide cycle. Additionally, parts of the anchorage that are full of water at high tide can turn out to be mudflats when the tide goes out.
At low tide we like to go ashore because there is a lot more beach and shore for exploring
The second result is big currents. As the tide is forced through the tortured channels in the archipelago, the islands and bottom contours act to accelerate the flow. Currents of 3-5 knots are not uncommon, and the flow can reach up to 8 knots. Since Madrone usually cruises at 7 knots or so, having a 3 knot current pushing us forward (so that our speed over ground is 10 knots) is a lot different than having the same current against us (so that our speed over ground is 4 knots).
Watching the tide has become a big part of our lives here.
Check out Madrone going 10.4 knots under sail (thanks to the 5.2 knots of current pushing her along)
