Accretion and Avulsion, 7 Attorney Title Research Checks

A deed describing a boundary as running to a river is describing something that moves. Whether the boundary moved with it is decided by a distinction the common law drew long ago and still applies, which is that gradual change moves the line and sudden change does not.

That sentence disposes of the doctrine and none of the difficulty. Which kind of change occurred, over what period, is a question of fact that nobody witnessed, litigated decades later from survey evidence and aerial photography.

The doctrine in four terms

Precision matters here because the words are frequently used loosely.

• Accretion — gradual, imperceptible deposit of soil along the bank. The boundary moves and the riparian owner gains.
• Erosion — the gradual counterpart. The boundary moves and the owner loses.
• Reliction — water gradually receding, exposing land. Treated like accretion.
• Avulsion — a sudden, perceptible change, typically a flood cutting a new channel. The boundary stays where it was, which can leave it running through dry ground or open water.

The rationale is sometimes misstated as fairness. It is closer to practicality, since a line that shifts imperceptibly can be followed, while a line that jumps a quarter mile overnight cannot be followed without transferring substantial acreage by accident.

Why this surfaces so long afterward

Because nothing happens at the time. A river moves, nobody records anything, and the parties continue farming what they have always farmed. The question arises when somebody sells, surveys, or discovers that the acreage on the tax roll no longer matches the acreage in the deed.

By then the evidence is historical. Original government survey notes and plats, successive aerial photographs, old bridge and levee records, and whatever the chain says about acreage at each conveyance. Reconstructing that is research rather than litigation, and it is the factual base any argument has to rest on — the same reconstruction problem described in legal description defects.

7 checks for the file

1. Read the call precisely

A boundary running “to the river” behaves differently from one running “to the thread of the stream” or to a fixed monument “on the bank.” Only the first two are ambulatory, and the difference is in the words.

2. Establish whether the water is navigable

Navigability decides who owns the bed, and in many states a navigable watercourse means the bed belongs to the state regardless of what the deed recites. The analysis overlaps with riparian rights and waterfront research.

3. Track acreage across every conveyance

Deeds reciting acreage give you a series of data points. A tract that was 160 acres in 1890, 154 in 1948 and 171 today has a story, and the chain is where it starts.

4. Look for a recorded boundary agreement

Neighbors sometimes settle these by agreement and record it. That instrument, where it exists, usually ends the inquiry and is far cheaper to find than to litigate.

5. Check for artificial causes

Accretion caused by the landowner’s own improvements, or by a levee or channel project, is treated differently in many states. A dam upstream can change a river’s behavior permanently, and whose project it was can matter.

6. Reconcile against the survey record

Successive surveys are the best contemporaneous evidence of where the line was understood to be. Where a surveyor noted a discrepancy, that note is worth more than a later reconstruction, and the root of title analysis in marketable record title acts may limit how far back it matters.

7. Confirm nothing in the chain already resolved it

A quiet title decree, a partition, or a condemnation award may have fixed the boundary years ago. Checking that first avoids relitigating a settled question, and the mechanics are those in the quiet title action guide.

What the search contributes and what it cannot

The search produces the chain with every call and every acreage recital, the recorded plats and surveys, any boundary agreement or decree, and the instruments in full rather than summarized. On a question decided by the exact wording of a call, an index abstract is useless.

What it cannot do is establish what the river did. That is proved with historical imagery, survey evidence and frequently expert testimony, and no records search substitutes for it. A records search reports what was recorded and indexed in the county over the term searched, and an empty result does not establish that no boundary dispute exists.

Nor does it determine which doctrine applies. That is state law, it varies, and the characterization of a particular change is a question of fact for a court — the same division as in easement and boundary dispute research.

Where it bites in practice

Three situations account for most of the files. A sale where the survey acreage does not match the deed, which is the discovery sequence in commercial property acquisition title due diligence. A dispute between neighbors after a flood year. And a mineral or agricultural transaction where the acreage figure drives the price directly.

In all three the useful first step is the same, which is getting the chain with its calls and acreage recitals in hand before anybody commissions an expert. The chain frequently narrows the question or answers it outright.

How AFX Research supports the analysis

AFX Research runs in-person searches, certified abstracts, and full document copies from any U.S. county — delivered in 12–72 hours and backed by our search guarantee. On a boundary question that means every deed call as written, the recorded plats and surveys, and any agreement or decree already of record.

Order a title search naming the parcel and the watercourse, or compare our search products if you are deciding how far back the chain needs to run.