If you've invested in a boat, you'll want to protect it whether it's on the water or secured at the dock. A spring line is a docking line that helps limit your boat's forward and backward movement while it's tied up. When used correctly, spring lines improve stability, reduce strain on your dock lines, and help protect both your boat and your dock.
Whether you're new to boating or looking to improve your docking skills, understanding how spring lines work is an important part of safe boat ownership.
Related Blog: 5 Ways to Improve Your Dock's Appearance & Safety
What is a Spring Line?
A spring line is a dock line that helps control your boat's movement while it's tied to the dock.
There are two types:
- Forward spring line: Runs from the stern cleat of the boat to a dock cleat located toward the bow. This helps prevent the boat from moving backward.
- Aft spring line: Runs from the bow cleat of the boat to a dock cleat located toward the stern. This helps prevent the boat from moving forward.
Using both spring lines together helps keep your boat secure while minimizing unnecessary movement caused by wind, waves, or changing tides.
Where Do You Attach Your Spring Lines?
Spring lines are attached to dock cleats and boat cleats to create a stable pivot point.
Depending on your boat and docking situation, you may attach a spring line to:
- The bow
- The stern
- A midship cleat
- A dedicated spring cleat
With practice, you'll learn which attachment point works best for your docking conditions and boat size.
What Else Should I Know?
The logistics surrounding your boat's upkeep can be complicated. Here is a list of things you should be aware of:
Choose the Right Cleats
Make sure your cleats are sized appropriately and properly secured. You need at least four cleats: one on each side of the bow and stern. Many people find midship cleats useful, too, and if you have a boat over 20 feet, this is definitely something you should explore.
Use the Proper Line Length
Lines are best when they are a bit longer than your boat. Nylon is an optimal material because it has a stretch that works well under tension and helps to reduce shock load. Go for a length that's a few feet longer than your boat.
Depart the Dock Safely
As you leave the dock, run the line around the base of the cleat before bringing the bitter end on board. Cleat off the end or designate someone to release the line.
Why Spring Lines Matter
Many boat owners focus on bow and stern lines but overlook the importance of spring lines. Adding them to your docking routine can help:
- Reduce forward and backward boat movement
- Improve stability while docked
- Reduce stress on cleats and dock lines
- Help protect your boat during changing tides and rough conditions
- Make docking and departing more controlled
Proper docking techniques, combined with a well-built dock and quality hardware, go a long way toward protecting your investment.
Frequently Asked Questions
What is a spring line used for?
A spring line helps limit your boat's forward and backward movement while it's tied to the dock. It improves stability and helps reduce strain on your dock lines during changing tides, wind, and wave conditions.
Where do you attach a spring line?
A spring line is attached between a boat cleat and a dock cleat. Depending on whether you're using a forward or aft spring line, it connects from either the bow or stern to a cleat positioned farther along the dock.
Should every boat use spring lines?
While smaller boats may not always require them, spring lines are recommended for most docked boats because they improve stability and help protect both the vessel and the dock from unnecessary movement.
The Boat Lift and Dock Building Process
If you have more questions or concerns about your dock, boat, or other marine equipment, contact Duncan Seawall and we'd be more than happy to help and answer any questions you may have.
