Wyoming Extends the Meander Line Rule to Private Conveyances and Fixes Non‑Navigable Riparian Boundaries at the River’s Thread Absent Clear Contrary Intent

Precedents Cited

1) Foundational meander-line doctrine (federal)

The Court anchored the doctrine in St. Paul & Pac. R.R. Co. v. Schurmeir, which explained that meander lines are run “not as boundaries of the tract, but for the purpose of defining the sinuosities of the banks of the stream.” This supports the core proposition adopted here: a meander line is typically evidence of a water boundary—not a fixed boundary itself.

2) Wyoming adoption for water boundaries (prior Wyoming law)

Wyoming’s principal in-state anchor was Johnson Irrigation Co. v. Ivory. There the Court treated a meander line shown on approved maps as intended to coincide with the natural shore and held “the body of water itself, and not the surveyed meander line, is the true boundary.” The present decision extends the logic of Johnson Irrigation Co. v. Ivory beyond its federal-patent/right-of-way setting by expressly confirming the same rule applies to private conveyances unless clearly limited.

The “thread” rule for non-navigable streams was supported by Jourdan v. Abbott Constr. Co., Wilson v. Lucerne Canal & Power Co., and Glover v. Giraldo. Those cases supply the default presumption: when a non-navigable river is the boundary, title extends to the centerline/thread.

3) Persuasive out-of-state subdivision and metes-and-bounds applications

To address the Heins’ reliance on platting and metes-and-bounds calls, the Court found guidance in:

• Andersen v. Monforton (Montana): a deed and subdivision plat describing a boundary “meandering” along a riverbank did not cut off riparian rights; lot boundaries extended to the river under the meander line rule.
• Ash v. Merlette (Montana): even without using the word “meander,” a metes-and-bounds description tracking a waterbody’s irregular edge is generally treated as an approximate meander line absent clear intent to fix a boundary at the plotted line.
• Stott v. Stevens (Oregon): a subdivision plat’s call to a “gov[ernment] meander corner” evidenced intent that the plat extend to the ocean, notwithstanding the meander line’s offset from the plat boundary depiction.
• Ford v. Butte Cnty. (California): cited for the general acceptance that meander-line principles apply across contexts.

These authorities reinforced two key moves in the Court’s reasoning: (i) plats do not inherently defeat the meander line rule; and (ii) boundary calls that follow water’s irregular edge are often approximations, not fixed severances of the riparian margin.

4) Deed/plat interpretation framework

The Court’s interpretive approach rested on Wyoming contract-like deed principles from Smithson v. Lindzey, drawing on Seven Lakes Dev. Co. v. Maxson and Gilstrap v. June Eisele Warren Tr. (plain meaning, four-corners focus when unambiguous), while acknowledging (via Leeks Canyon Ranch, LLC v. Callahan River Ranch, LLC and Ecosystem Res., L.C. v. Broadbent Land & Res., L.L.C.) that surrounding circumstances may still inform intent. Plat language is likewise interpreted under Carnahan v. Lewis.

5) Summary judgment posture

The Court’s de novo review and “no genuine issue of material fact” standard relied on Hurst v. Metro. Prop. & Cas. Ins. Co., Lindsey v. Harriet, Rafter J. Ranch Homeowner's Ass'n v. Stage Stop, Inc., Gumpel v. Copperleaf Homeowners Ass'n, Inc., and Teton Cnty. Bd. of Cnty. Comm'rs v. Bd. of Land Comm'rs. The dispute turned on legal effect of undisputed conveyance language and chain of title.

Legal Reasoning

1) The Court articulates (and adopts) the private-conveyance meander-line rule

The decision’s central doctrinal move is explicit: although Wyoming had applied the meander line rule in Johnson Irrigation Co. v. Ivory, it had not “expressly held the meander line rule applies to private conveyances.” It now does, adopting the generally recognized principle that the rule “applies to government and private surveys alike,” with a single controlling caveat: the instrument must “clearly and unequivocally” manifest an intent to fix a more limited boundary.

2) Application to the 1958 deed: “meander line … right bank” signals a water boundary, not a cutoff

The Court treated the 1958 Trevett-family deed to Pursel as unambiguous. Its call to a point “on the meander line of the southerly and right bank of the North Platte River” and then “along the meander line” aligned with standard meander methodology: a survey approximation used to describe a water boundary. Under Wyoming’s rule for non-navigable streams, the conveyance therefore extended to the river’s thread. The Court also relied on the fact (from Wilson v. Lucerne Canal & Power Co.) that the North Platte River in Wyoming is non-navigable.

3) Chain-of-title consequence: the north-side grant could not include what was already conveyed/excepted

After the 1958 conveyance, Ms. Trevett Greene’s later conveyance of the remaining quarter-quarter to the Wyoming National Bank of Casper expressly excepted the prior transfer. Thus the north-side chain (leading to Trails West and ultimately the Heins’ Park 10 quitclaim) never acquired the meander land. This mattered more than any plat depiction: a subdivider cannot plat (or later convey) land it does not own.

4) The statutory argument fails: Wyo. Stat. Ann. § 34-12-102 validates descriptions, not title manufacture

The Heins argued subdivision plats “fully complied” with Wyo. Stat. Ann. § 34-12-102, making plat-based lot descriptions “good and valid.” The Court construed the statute as ensuring valid descriptive references for conveyancing and taxation, not as a mechanism to override chain-of-title defects or to vest title to land outside the subdivider’s ownership. Accordingly, the statute could not fix a boundary at the meander line so as to transfer the disputed strip into Park 10.

5) Distinguishing Glover v. Giraldo: “bank” as a deliberate cutoff vs. “meander line” as an approximation

The Court rejected the Heins’ reliance on Glover v. Giraldo, where repeated deed references to the “left bank” showed specific intent to stop at the bank. Here, by contrast, the deed referenced the “meander line … right bank,” which—under the meander line rule—typically indicates a water boundary rather than an intent to sever the riparian margin at an artificial line.

6) Confirmatory evidence from the Red Butte plat and covenants

The Red Butte plat’s references to a “Special Meander Corner, GOVERNMENT BRASS CAP” and the labeling of the “MEANDER LINE RIGHT BANK NORTH PLATTE RIVER” supported an intent that Red Butte be bounded by the river (consistent with Stott v. Stevens). The subdivision covenants referencing “stream or river front properties” and dock/launching limitations further corroborated the development’s riverfront understanding.

Impact

• Clear statewide rule for private deeds: Wyoming now expressly applies the meander line rule to private conveyances. Future disputes involving platted river/lake boundaries and metes-and-bounds calls near water will begin from the presumption that the water—not the meander line—is the boundary, unless the deed clearly says otherwise.
• Heavier burden on “fixed-line” proponents: Parties seeking to stop title at a plotted shoreline/meander call must show “clear and unequivocal” limiting intent (language like “bank”/“high-water mark as boundary,” coupled with other limiting signals, may be litigated under this standard).
• Subdivision practice and title underwriting: Plats and statutory plat-description validity (Wyo. Stat. Ann. § 34-12-102) cannot cure a missing link in title. Survey depiction of parks/tracts across or under rivers will be scrutinized against earlier deeds and exceptions.
• Riparian allocation clarity for non-navigable streams: By reaffirming the thread rule, the decision reduces uncertainty for adjoining landowners along non-navigable rivers—particularly where rivers migrate and meander lines no longer match current water location.