05/30/2026
⚠️🛟 We recently saw some questioning what makes the water at the Weymouth Furnace so dangerous, and that is a great question! With summer fast approaching, there is no better time to explain the dangers.
As most of us form this area know that while cedar water is warm at the top, the temperature drops dramatically as sun can not pe*****te the water, the water can be warm at the surface and in the 50s at the bottom, depending on depth.
⚠️ What most people don’t know is just past the bridge, on the park side, there is a very deep hole in the river. We have measured this hole up to 20 feet deep at times. The temperature of the water this deep can drop so drastically that it can shock the body when rapidly exposed.
⚠️ Additionally, in this hole there is a lot of debris, the most dangerous of which are large branches and trees that can trap people.
⚠️ The obvious danger here is the current, the water can turn almost into rapids just past the bridge and can reach up to 2.5 knots, which may not sound like a lot, however anything 3 knots and over is considered extremely dangerous and near impossible for the average person to swim against.
Additionally, the rapid water creates multiple different flows or currents in the water. In a very small area you have an Eddy, which is a swirling reverse current. You also have a Turbulent Flow, which is rapid water moving in all directions. There is also Laminar Flow, which is fast moving water in a straight line.
While the severity of the water can change drastically, the worst being during the days following heavy rain fall, this all creates an extremely challenging environment to swim in.
⚠️🛟 When you add all of this together, it is very easy for swimmers to get swept under the water, when you get deep enough your body experiences a shock from the temperature drop. At this point, you are panicked and disoriented as you can not see that deep in cedar water, and then you can also get trapped or tangled in the branches.
⚠️‼️ Please do not swim at the Weymouth Furnace! ‼️⚠️
