In Ten Mile, Your Dock Rights Depend on a Date No One Puts in the Listing

Why would two waterfront lots a half-mile apart on Watts Bar Lake, both in Ten Mile, both with comparable acreage and a similar view down the channel, carry dock rights that aren't remotely close? Not because one seller negotiated harder. Not because of soil or slope. Because of a filing date buried in a subdivision plat, one that has nothing to do with the house, the shoreline, or the price a seller wants.

That date is November 1, 1999. The Tennessee Valley Authority uses it to draw a line through every residential shoreline lot on the reservoirs it manages, including the 700 miles of shoreline that make up Watts Bar. Cross that line one way and a lot can carry a dock footprint up to 1,800 square feet with no requirement to keep 50 feet of clearance from the neighbor's dock. Cross it the other way and the same lot is capped at 1,000 square feet, has to maintain that 50-foot buffer, and if the shoreline is too tight to fit both, TVA can require the owner to share a community dock instead of building a private one. None of that shows up on the listing sheet. All of it shows up in the permit file, and all of it shows up in the price.

The Rule Isn't About the Shoreline. It's About the Paperwork Behind It.

TVA's own regulation, Section 1304.204 of the federal shoreline rules, sets the baseline: residential docks, piers, boathouses and other water-use facilities can't exceed a footprint of 1,000 square feet. That's the default for anyone building new. The exception is what TVA calls "preexisting development," and the definition is specific enough that it's worth quoting directly from the federal code:

"The water-use facility will be located in a subdivision recorded before November 1, 1999, and TVA permitted at least one water-use facility in the subdivision prior to November 1, 1999; or if there is no subdivision, where the water-use facility will be located within a quarter-mile radius of another water-use facility that TVA permitted prior to November 1, 1999."

If a lot clears that bar, its dock footprint allowance jumps to 1,800 square feet, an 80 percent increase over the standard cap. If it doesn't, the owner is building under 2026 rules regardless of how long the surrounding neighborhood has existed.

The 50-Foot Rule Shows Up After the Offer, Not Before

The footprint cap gets most of the attention because it's the easier number to explain. The spacing rule is the one that actually changes what a buyer experiences on the water. TVA's regulation states plainly that docks proposed in subdivisions recorded after November 1, 1999 must sit at least 50 feet from a neighbor's dock, and when a shoreline is too narrow or too curved to accommodate that spacing, TVA can require a group or community facility instead of a private one.

That means a buyer closing on a newer platted lot with 60 feet of shoreline frontage might not be buying the private dock pictured in the listing photos. They might be buying a shared slip at a community facility, permitted under someone else's name, with rules about maintenance and access that were negotiated before that buyer ever saw the property. It's a detail that only surfaces when someone actually pulls the Section 26a permit file, which is exactly the point. Nobody checks it until the deal is already moving.

Here's how the two categories compare, side by side:

Why Ten Mile's Median Price Doesn't Mean What It Looks Like

As of mid-July 2026, homes actively listed along Watts Bar Lake, spanning the shoreline that runs through Ten Mile, Spring City, Rockwood and Kingston, carried a median list price near $425,000, averaging roughly $297 per square foot and sitting on the market about 106 days. That number gets quoted as if it describes a single market. It doesn't. It's an average pulled from lots governed by two different rulebooks.

The same mid-July inventory made the point better than any statistic could. One Ten Mile listing in Sandy Bottom Estates was asking $474,900. Another, in Lakeside Coves, less than a mile away on the same lake, was asking $1,065,000. Square footage and bedroom count don't explain a gap that size on their own. Dock rights are part of what does. A buyer comparing those two listings on price per square foot alone is comparing two different products that happen to share a lake.

This is the part a median price can never tell you: whether the dock you're buying is grandfathered into an 1,800-square-foot allowance from a subdivision platted decades ago, or capped at 1,000 square feet with a 50-foot rule that might push you into a shared facility. Ten Mile has both kinds of shoreline, sometimes on the same road. The lake doesn't care which decade a lot was recorded. TVA does.

What to Actually Check Before You Fall in Love With a Lot

The fix isn't complicated, but it has to happen before the offer, not after the inspection period starts. A buyer or their agent should be able to answer these before writing a contract on any Ten Mile waterfront lot:

1. When was the subdivision plat recorded? If there's no subdivision, is there a permitted dock within a quarter mile that predates November 1, 1999?
2. Does the seller have the existing Section 26a permit on file, and does it show a footprint of 1,000 or 1,800 square feet?
3. If the lot is post-1999, what's the actual shoreline distance to the nearest neighboring dock? Is it 50 feet or close to it?
4. If spacing can't be met, has TVA already required a community facility, and if so, what does the shared-use agreement actually say about maintenance, access, and future modifications?
5. Does the existing dock on site match what's on the permit? A dock that's been expanded without TVA sign-off is a separate problem, but it's one that surfaces from the same file.

None of this requires a lawyer or an engineer to start. It requires asking for the permit before the earnest money moves, and reading the recording date on the plat instead of assuming a private dock today means a private dock forever.

Frequently Asked Questions

Does the classification affect resale value, or just what I can build? Both. A lot capped at 1,000 square feet with a mandatory 50-foot buffer is a smaller, more constrained asset than a comparable lot grandfathered to 1,800 square feet with no spacing requirement, even if the house and acreage are identical. Future buyers will run into the same rule, which means the constraint doesn't go away at resale. It transfers with the lot.

If my subdivision was platted after 1999, is there any way around the 50-foot rule? Not through the waiver process. TVA's waiver provision is only open to lots that already qualify as preexisting development, so it isn't a path for a newer subdivision to argue its way into the older, looser standard. If a lot was recorded after November 1, 1999, the 50-foot spacing rule applies on its own terms.

What if there's no formal subdivision at all, just a handful of lakefront lots along a private road? The quarter-mile radius standard still applies. If TVA permitted a water-use facility within a quarter mile before November 1, 1999, a lot without a recorded subdivision can still qualify for the larger footprint allowance. This is exactly the kind of detail that only shows up by requesting the permit history directly rather than assuming based on how old the neighborhood looks.

Where do I actually find this information? The subdivision's recording date is in the county register of deeds. The dock's permit history, including footprint size and permitted date, comes directly from TVA's Public Land Information Center. Neither number appears on an MLS listing.

Buying waterfront in Ten Mile means buying two things at once: the house, and a regulatory position on the shoreline that was decided years before the listing went live. The second part doesn't photograph well, which is exactly why it gets skipped. It shouldn't be.

If you're comparing waterfront listings on Watts Bar Lake and want someone who reads the permit file before you write an offer, not after, Kathy May-Martin and the team at Coldwell Banker Jim Henry & Associates can walk the shoreline classification with you before you fall for the view. Schedule Your Consultation to start with the file, not just the photos.