Definition
A burrochium is a medieval legal term for a small dam, weir, or obstruction constructed across a river or watercourse for the purpose of trapping fish. The structure typically incorporated fish traps or weirs that directed the flow of water to capture fish as they moved through the current. The term appears primarily in historical English legal texts concerned with riparian rights, fishing privileges, and the regulation of waterways.
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Why It Matters in Research
BURROCHIUM is a term researchers will encounter almost exclusively in medieval and early modern English legal sources — manor court records, grants of fishing rights, riparian disputes, and documents touching on rights of fishery. It does not appear in modern statutory or common law usage; any appearance of this term signals a historical document or a historical gloss on one.
The primary research trap is terminological overlap. BURROCHIUM, weir, wear, fish dam, and kiddle all describe related but legally distinct structures in historical sources, and these terms are not always used consistently across time or across jurisdictions. A researcher tracing a historical fishing right or riparian easement must be alert to the possibility that different instruments describing the same physical structure may use different vocabulary, and that the legal entitlements attached to each term could vary.
The term connects directly to the broader body of English common law governing several categories of rights: the right of fishery (including free fishery, common of fishery, and several fishery), rights to obstruct or divert waterways, and the crown's interest in navigable rivers. Structures like burrochia were frequently the subject of royal regulation — the Magna Carta itself (chapters 33 and 47 in various versions) addressed the removal of kiddles and weirs from rivers, reflecting ongoing tension between private fishing structures and the public interest in free navigation. Researchers working in this area should treat BURROCHIUM as a point of entry into that cluster of riparian and fishery law, not as an isolated curiosity.
Because the term appears in manorial and grant documentation, it may surface in land records where fishing rights are appurtenant to a manor or estate. Researchers examining historical title chains or riparian boundaries should note whether any associated fishing structure is described, as this may affect the scope of the right conveyed.
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Historical Dictionary Support
Both editions of Black's Law Dictionary (first and second) provide identical, minimal entries: "A burroch, dam, or small wear over a river, where traps are laid for the taking of fish," with attribution to Cowell. The reference is to John Cowell's *The Interpreter* (1607), a glossary of legal terms that was itself a primary source for many early English legal dictionaries. Both Black's editions simply relay Cowell's gloss without elaboration, legal context, or historical development.
Neither edition addresses the relationship between BURROCHIUM and the body of fishery law, the Magna Carta provisions on river obstructions, or the manor-court context in which such structures typically appeared. This is a meaningful gap: the term in historical practice carried legal weight tied to the nature of the fishing right held — whether by royal grant, prescription, or custom — and disputes over burrochia would have turned on those underlying entitlements, not merely on the physical structure itself.
Researchers should treat the Black's entries as a starting point for identification only. For substantive legal context, Cowell's *Interpreter* and treatises on the law of waters and fisheries (such as those by Matthew Hale on *De Jure Maris*) provide more useful grounding.
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Jurisdictional Note
BURROCHIUM is a term of English legal origin with no direct modern counterpart in American law. In research touching on early American colonial grants or land patents that imported English riparian terminology, the concept may appear indirectly, but the term itself is not a feature of American legal doctrine.
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