As I mentioned in a post last week, the first topic covered in my article "Nature Versus the Common Law: Nature as a Norm in the Water Law of the British World" is the question of whether the water, bed, or other resources of a non-tidal river belonged to the riparian landowners or to the state or public.
While the civil law (for example Article 538 of the Code Napoleon) distinguished between private and public rivers based on tests of navigability and floatability, the English common law adopted a slightly different distinction : Tidal rivers were held to be the property of the Crown, while rivers and lakes above the reach of the tide were the property of the adjoining landowners, with each riparian owner owning the river from the edge of his dry land up to the median of the water body ("usque filum aquæ" or "ad medium filum"). Non-tidal but navigable bodies of water typically were subject to a public right or servitude of navigation, while the water, the submerged land, and other resources (such as fish) belonged to the riparian owners.
These rules were relatively uncontroversial in England, but in British colonies and the new United States they were often felt to be inappropriate to the environmental reality of other continents, in which rivers might be kilometers wide in some portions and navigable for thousands of kilometers above the reach of the tides, while freshwater lakes might bear a closer resemblance to seas than to the small lakes of England. In this context, a rule under which all non-tidal waters were private seemed problematic to many.
The first reported case in which the tension between the received law of England and the local environment arose was the 1807 Pennsylvania case of Carson v Blazer, in which a landowner along the Susquehanna River, near Harrisburg, demanded compensation from some fishermen who had fished shad from the river alongside his land4. As the Susquehanna at this point was navigable but not a tidal river, the common law rule seemed to be clear – the river, and the right to fish, belonged to the riparian owners. But Chief Justice William Tilghman, presiding over the trial, thought otherwise, distinguishing between the geographies of England and Pennsylvania :








