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Duvall Bridge & Telegraph Road
Duvall Bridge, built in 1907, replaced an earlier wooden bridge crossing the Patuxent River. As part of a wagon road, it served the 19th-century Snowden companies. Telegraph lines between Baltimore and Washington, DC, hung from poles placed along this road.
DDT Plots
Patuxent researchers sprayed plots in the 1960s with DDT and similar pesticides to study the accumulation of pollutants in earthworms. Worms were found to contain up to 100 times as much pesticide as was applied to the soil. Scientists proved such high levels harmed birds. |