When boating on the river you may encounter strainers what are strainers?

Strainers are obstacles in a river, such as fallen trees or branches, that allow water to flow through while blocking larger objects, including boats and people. These submerged or partially submerged hazards can create dangerous situations, as they can trap or capsize a boat. Boaters should be cautious and avoid navigating near strainers to ensure safety on the water.