Basically the Rule is simple, the state can sell you the right to own property from the high water mark onward, anything else the state can not and has never sold. The state takes the legal position that the property, if it is now between the low and high tide marks, no longer exists. The same rule applies in most states to stream and creeks, those are public highways that the state NEVER sold to the adjacent property owners. Thus even if you own both sides of a stream, River or Creek you do NOT have exclusive use of such stream, river or Creek unless the water flow starts on your property. i.e. if the spring the stream starts in, is on your neighbor's property the stream is a public road right through your property. It is a private road on the property the spring is in, but a public road as soon as it crosses on to your property.
More on this concept and the fact it is English Common Law derived:
http://www.texasep.org/html/lnd/lnd_7bch_access.htmlhttp://www.texasopenbeaches.org/open.htmhttp://www.surfrider.org/texas/issues/suit/A 1974 Supreme Court advisory opinion to the Legislature of Massachusetts about the high and low tide marks. Massachusetts since the 1640s had a policy that people's property rights ends at the low tide mark instead of the Common law Rule of the High Tide Mark (this was based on a Colonial Statute saying that ownership of land extended to the low tide mark, but subject to the rights of "fishing, fowling and navigation"). This is the law in Massachusetts to this day (and Maine which came under the same Stature for Maine was Part of Massachusetts prior to 1820). Thus in Maine and Massachusetts people own land to the low water mark subject to the the right of the Public to "fishing, fowling and navigation".
Most states follow the Common law rule, as does Texas, but I point out the Massachusetts rule which is directly opposite of the Common law rule. This is acknowledged even by Massachusetts which says the difference is a product of Statute NOT the Common Law:
http://www.lawlib.state.ma.us/beach.htmlThe actual Opinion I cite:
http://masscases.com/cases/sjc/365/365mass681.htmlCalifornia follows the Common Law Rule:
http://www.beachlaw.info/?p=256http://www.surfrider.org/stateofthebeach2003/3-meth/access.asphttp://beachlaw.info/links.phpOregon follows the Common Law Beach Law:
http://www.orgov.org/beachbill.htmlFlorida also follow the Common law rule that private property ends at the High Tide Mark, but excludes area of sand that never gets wet (Oregon and most other states include such high sand areas as part of the beach, Florida does NOT seem to do so):
http://www.law.fsu.edu/journals/landuse/Vol151/spain1.htmWashington Beach law, varies from area to area, the Territory of Washington sold land only up to the high Tide mark, but since Washington became a State, the state has sold lands down to the low tide mark, i.e. ownership varies dependent on the deed:
http://www.surfrider.org/qa_access.aspx?stsel=WAhttp://www.funbeach.com/attractions/beach_driving.htmlThe rest of the state I can not find any rule on a quick search, thus all I can say is most states follow the Common Law rule i.e. property rights end at the high tide mark, but many states have different rules as shown by the Example of Maine, Massachusetts and Washington.