USS Geranium was a steamship acquired by the Union Navy during the American Civil War for the purpose of using her as a tugboat in support of Union ships on the blockade of Southern waterways. However, in addition to her tug duties, she also served as a picket ship, dispatch boat, supply runner and other duties assigned to her by the Navy.
Geranium, formerly John A. Dix, was built at Newburgh, New York, in 1863; purchased by the Navy at New York City 5 September 1863; and commissioned at New York Navy Yard 15 October 1863.
Geranium departed New York 20 October for duty off Charleston, South Carolina, with Rear Admiral John A. Dahlgren's South Atlantic Blockading Squadron. Arriving 4 November, for the next 6 months she operated as a picket boat and was frequently employed as a dispatch boat and light transport to such diverse stations as Ossabaw Sound, South Carolina, and St. Johns River, Florida. Occasionally, she transported Admiral Dahlgren during visits to various ships of his squadron.
Between 3 and 10 July 1864, Geranium participated in a diversionary expedition up the Stono and North Edisto Rivers south of Charleston, South Carolina, to divert Confederate attention from the Charleston blockade and to cut the important Charleston and Savannah Railroad.
She supported the movement of troops under General Birney up the North Edisto River, towing and transporting supplies for the expedition. On 3 July she contacted and engaged a strong Confederate battery at the mouth of the Dawhoo River, a bombardment which Admiral Dahlgren reported was "done very handsomely." After completing demonstration operations, she supported the withdrawal of Federal troops from the tidewater islands south of Charleston.
Continuing her picket, dispatch, and transport duties from 12 to 17 February 1865, Geranium participated in joint Army-Navy operations at Bull's Bay north of Charleston, and on the 16th and 17th she supported diversionary amphibious landings which hastened the Confederate evacuation of Charleston the following day.
Admiral Dahlgren then ordered her to the mouth of the Santee River, where she supported naval operations against Georgetown, South Carolina, before departing 28 February on a reconnaissance mission up the Santee.
With launches Lilly and Eva in tow she ascended as far as Black Oak Island and gained valuable information about the depth and navigability of the river. As a result of this intelligence, General William Tecumseh Sherman's troops could be supplied from transports on the Santee rather than solely by railroad.
Geranium remained along the South Carolina coast until after the end of the war. Departing Charleston 17 June, she steamed with and (Admiral Dahlgren embarked) and arrived Washington, D.C. 21 June.
Geranium decommissioned there 15 July and was sold 18 October to the U.S. Treasury Department for use In the Lighthouse Service.