Welcome to the Maryland Department of Natural Resources Maps and Data Index.

Dividing Lines, Tidal and Nontidal Waters:

Click on a region for a closer view of the tidal/nontidal dividing lines in that area. Central Region Southcentral Region Southern Region Eastern Region

 

The following boundaries are designated as official dividing lines for tidal and nontidal waters. These boundary lines are for the purpose of delineating those areas in which nontidal fishing licenses or Chesapeake Bay sportfishing licenses are required and tidal or nontidal fishing regulations apply, and have no other legal significance.

  1. Harford County.
    1. Winterís Run: Dam located one half mile south of State Highway 7, the Old Philadelphia Road.
    2. Bynum Run: Old Philadelphia Road Bridge on State Highway 7.
    3. James Run: Old Philadelphia Road Bridge on State Highway 7.
    4. Deer Creek: Railroad bridge located at the mouth of Deer Creek.
  2. Baltimore County.
    1. Big Gunpowder Falls: Three-fourths of a mile south of State Highway 7, the Old Philadelphia Road at B&O Railroad Bridge.
    2. Little Gunpowder Falls: Three-fourths of a mile south of State Highway 7, the Old Philadelphia Road at B&O Railroad Bridge.
    3. Stemmers Run: Golden Ring Road Bridge.
  3. Baltimore and Howard Counties. Patapsco River: B&O Viaduct at Relay.
  4. Anne Arundel and Prince Georgeís Counties.
    1. Patuxent River:
      1. Mainstem: bridge on Route 214;
      2. Lyons Creek: Route 4;
      3. Stocketts Run: confluence with the river;
      4. Rock Run: confluence with the river;
      5. Ferry Branch: confluence with the river.
    2. Severn River: Bridge on State Highway 3.
    3. Furnace Branch: Route 2.
    4. Anacostia River: Northeast Branch Bridge at northbound lane of Alternate Route 1, Bladensburg Road; Northwest Branch Bridge at southbound lane of Rhode Island Avenue.
    5. Marley Creek: Route 10.
    6. Magothy River: Catherine Ave.
    7. South River and its tributaries:
      1. North River: Rutland Road;
      2. Bacon Ridge Branch: Chesterfield Road;
      3. Beards Creek: Route 214;
      4. Broad Creek: Harry S Truman Parkway.
  5. Charles, Montgomery, and Prince Georgeís Counties.
    1. Potomac River: Northwest quadrant boundary lines of the District of Columbia, manmade dam at Little Falls.
    2. Piscataway Creek: Bridge on State Highway 224 (Livingston Road).
    3. Henson Run: Bridge on Old Broad Creek Road.
    4. Western Branch: Bridge on State Highway 4.
    5. Nanjemoy Creek:
      1. Mainstem: Route 6;
      2. Mill Run (Burgess Cr.): Route 6;
      3. Hill Top Fork: Route 6;
      4. Wards Run: Route 6.
    6. Wicomico River: Allens Fresh, Bridge on State Highway 234.
    7. Port Tobacco Creek: Bridge on State Highway 6.
    8. Mattawoman Creek: Bridge on State Highway 225.
    9. Patuxent River:
      1. Swanson Creek: Route 381;
      2. Mataponi Creek: St. Thomas Church Road;
      3. Spice Creek: Route 382, Croom Road;
      4. Full Mill Branch: Route 382, Croom Road;
      5. Black Swamp Creek: Route 382, Croom Road.
    10. Pomonkey Creek: Fenwick Road.
    11. Hoghole Run: Route 6.
    12. Oxen Creek (Run): Route 210.
  6. Kent and Queen Anneís Counties.
    1. Chester River: 500 yards upstream from the Pennsylvania Railroad Bridge at Millington at the point where the Cypress Branch empties into the Chester River
    2. Unicorn Branch: The U.S. Geological Survey weir just east of State Highway
    3. Sassafras River: Route 299.
    4. Herring Branch: Route 299.
    5. Morgan Creek: Wallis Road.
    6. Red Lion Branch at its confluence with the Chester River.
  7. Caroline County.
    1. Choptank River: Bypass bridge on State Highway 313 on the outskirts of Greensboro.
    2. Tuckahoe Creek: Abandoned stone railroad bridge upstream of Route 404.
    3. Wattís Creek: Bridge on American Legion Road.
    4. Fowling Creek: Wooden Bridge on Stratum Road about one mile below State Highway 16.
    5. Chapel Branch: Route 313 near Piney Grove Church.
    6. Marshy Hope Creek: At its confluence with Faulkner Branch.
    7. Mill Creek: Route 16.
    8. Hunting Creek: Route 331.
  8. Wicomico and Worcester Counties.
    1. Pocomoke River: Bridge on Whiton Crossing, 3 miles south of Powellville.
    2. Wicomico River: Isabella Street in Salisbury.
    3. Beaverdam Creek: Dam just upstream of U.S. Route 13 (Business).
    4. Nassawango Creek: Furnace Road.
  9. St. Maryís County.
    1. Park Hall Run: State Highway 5.
    2. McIntosh Run: Bridge at Clements on State Highway 237.
    3. Great Mills Run: Bridge on State Highway 5.
    4. Town Run: Bridge on State Highway 5.
    5. Chaptico Run: Chaptico Bridge on State Highway 234.
    6. Eastern Branch: Route 5.
    7. Dynard Run: Route 242.
    8. Tomakokin Creek: Route 470.
    9. Buds Creek: Route 234.
    10. Gilbert Swamp Run: Route 234.
  10. Calvert County.
    1. St. Leonardís Creek: Parran Road.
    2. Battle Creek: Bridge about 2 miles east of Bowens (Sixes Road).
    3. Parkerís Creek: State Highway 765.
    4. Hunting Creek: At bridge on State Highway 263 about 100 yards west of State Highway 4.
    5. Hallís Creek: Bridge on State Highway 4.
    6. Lyons Creek: Bridge on State Highway 4.
    7. Fishing Creek: One and one-half miles upstream from the mouth of the creek at Chesapeake Beach.
    8. Plum Point Creek: Bridge on State Highway 263.
    9. Mills Creek: Route 760.
    10. Hellen Creek: Mill Branch Road, near Solomons.
    11. Island Creek: Ross Road, near Brooms Island.
    12. St. Johns Creek: Route 4.
    13. Quaker Swamp: Routes 2/4.
  11. Susquehanna River. Conowingo Dam at US Route 1.
  12. Cecil County.
    1. Octoraro Creek: Bridge on U.S. Route 222.
    2. Rock Run: Confluence with the Susquehanna River.
    3. Mill Creek: Old Elk Neck Road.
    4. Principio Creek: Amtrack crossing below Route 7.
    5. North East River: Route 7.
    6. Little Elk Creek: U.S. Route 40.
    7. Big Elk Creek: Route 213.
    8. Bohemia River: Telegraph Road.
    9. Happy Valley Branch: Confluence with Susquehanna River.
  13. Dorchester County.
    1. Chicamicomico River: U.S. Route 50.
    2. Transquaking River: Dam at Higgins Mill Pond.

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