Quoted from phil-lee:I will check out the current laws, I have a feeling you are wrong. Have been all up around those parts and even if people don't like it the ones threatening to have us arrested were never successful.
Here are the Maryland Laws:
1. The State owns the land under the water, and the United States has an overriding interest in preserving public navigation.
2. The waterfront property owner has the right to accretion (such as a beach deposited by currents) and access, but a government may regulate access such as piers and wharves to assure that public rights are protected.
3. The right to extend and improve, where granted, transfers with the property.
4. The right to extend and improve does not allow a landowner to intrude on his neighbor’s rights.
5. The riparian owner has the “right of access” to and from the waters.
This even applies to folks building duck blinds in front of your property. It is a convoluted process involving how much waterfront you own or get permission to, but you can prevent people building duck blinds in front of your property. All dependent upon size of the navigable water, distance from property lines, etc. Took me two years to get my dock permit to go through. https://dnr.maryland.gov/wildlife/Pages/Licenses/riparian.aspx
Edit: here is Maryland’s metal detecting laws for state lands. Seems restrictive, but I get it. https://dnr.maryland.gov/Publiclands/Pages/MetalDetecting.aspx