Definition
Innavigability has two distinct legal meanings:
1. Insurance law. The condition of a vessel that is unfit for navigation — not merely damaged, but rendered incapable of completing the voyage as contemplated. This is a recognized basis for marine insurance loss claims and bears a specific relationship to, but is distinguishable from, shipwreck. Where shipwreck denotes a sudden, catastrophic event, innavigability may arise from cumulative deterioration, pervasive unseaworthiness, or other conditions rendering a vessel unable to proceed, without a discrete wrecking event.
2. Waterways and property law. The condition of a stream, river, or other body of water that is not navigable — either because it lacks sufficient depth or width, because it is obstructed, or because it is otherwise unsuited to commercial or practical navigation. Whether a waterway meets the legal threshold for navigability has significant consequences for federal jurisdiction, riparian rights, and public access.
Common Confusion
Innavigability and shipwreck are not synonyms, though both may give rise to marine insurance claims. Shipwreck implies a specific casualty — grounding, collision, foundering — identifiable as an event. Innavigability may be a condition that develops over a voyage, or that preexisted it, rendering the vessel incapable of proceeding without any single dramatic incident. European maritime law writers drew this distinction with some care. American courts and commentators, following Kent, recognized the distinction but did not always apply it with equal precision. Researchers working in 19th-century marine insurance sources should not assume the terms are interchangeable.
Why It Matters in Research
The term operates in two separate research contexts that rarely intersect, and conflating them will send a researcher down the wrong path.
In marine insurance research, innavigability is the key concept for claims based on a vessel's general unfitness to proceed, as opposed to claims grounded in a specific peril like fire, collision, or wreck. Kent's Commentaries (Vol. 3) is the primary American authority cited in the historical dictionaries, and researchers should go directly to that source — the dictionary entries are thin summaries. European treatises, particularly French and Dutch maritime law writers, developed the doctrine more fully; if the research touches 18th- or 19th-century marine insurance disputes, the foreign literature (filtered through Kent and Story) may be necessary.
In waterways and property law, the navigability question matters enormously for federal admiralty jurisdiction, ownership of streambeds, and the scope of public rights. Courts apply various tests — commercial navigability, navigability in fact, tidal tests — and the legal definition of navigability (and therefore innavigability) has shifted across eras. Historical sources using "innavigable" to describe a stream may be applying a different standard than a modern researcher expects. Federal and state courts have not always agreed on the threshold.
Burrill's entry contains a fragment that appears in neither Black's edition cleanly: a reference to an old English law meaning connected to exemplification of charters of feoffment, citing Coke (2 Co. 54a, Page's Case). This appears to be a textual corruption or editorial remnant in Burrill — the entry breaks off mid-sentence. Researchers should treat this fragment with caution and not rely on it as authority for a distinct third legal meaning without independent verification in the primary source.
Historical Dictionary Support
All three historical dictionaries draw on the same source: Kent's Commentaries, Vol. 3, p. 323 and note. The entries are nearly identical in substance, with Burrill adding the French derivation (innavigabilite) and the fragmentary old English law passage. Neither Black's edition adds analytical depth beyond Kent's formulation.
The convergence on a single secondary source — Kent — reflects the relatively thin American case law on the insurance meaning of innavigability in the period these dictionaries were compiled. The term was more developed in European maritime law than in American courts, and the historical dictionaries acknowledge this implicitly by noting that "foreign writers" drew the distinction from shipwreck. This is a signal to researchers that the American common law on this point was underdeveloped at the time of compilation and that the doctrine's edges were not well-settled domestically.
What the historical dictionaries do not address: the navigability-of-waterways meaning receives only a brief sentence in each entry, with no engagement with the constitutional and jurisdictional stakes of that question. By the time Black's first edition was published, federal navigability doctrine was already generating significant litigation. The dictionary entries underrepresent the legal importance of innavigability in that context.
Jurisdictional Note
Federal law governs navigability determinations for purposes of admiralty jurisdiction and Commerce Clause power, but states retain authority over navigability for purposes of property law and public trust doctrine. A waterway that is innavigable under federal standards may still be subject to state-law public rights. Researchers should identify which navigability question is at issue before selecting sources.