Steamer or Steamship

Steamer is an early term for any vessel power by a steam engine rather than sails.

Shipwreck Delaware
The Delaware, an 1880s screw steamer

Early steamers were propelled by large paddlewheels. "Side-wheelers", with the paddlewheels on each side, were more seaworthy, and therefore more common in ocean waters, while "stern-wheelers", with a single large paddlewheel at the back, were more common as riverboats. Later, these were replaced by more efficient screw (or propeller) vessels.

Shipwreck Black Warrior
The Black Warrior, an 1850s side-paddlewheel steamer. There are no stern-wheelers in the region that I know of.
Click
This sketch of the Delaware shows the remains that you can expect to find of such a vessel.

Of note is the universal pattern of:

< bow - boilers - engine - drive shaft - propeller - rudder/stern )

and the fact that the boilers are always in front of the engine. Identify any one of these features on the wreck, and you can orient yourself in even the murkiest conditions.

Shipwreck Delaware boiler
Boilers on the Delaware. In the foreground is an intact one. Next to that is a collapsed one; there are four altogether. In the background is the engine.
steam engine
An old postcard of the City of Keansburg, the last of the New York commuter ferries, and one of the last steamships to ply local waters - until 1968.
steam engine
One of the Keansburg's two triple-expansion steam engines, at Allaire State Park.

Shipwreck Olinda
Type:
shipwreck, steamer, Portugal
Built:
1887, England
Specs:
( 250 x 36 ft ) 1479 gross tons
Sunk:
Tuesday June 11, 1895
ran aground on Fisher's Island - no casualties
Depth:
20 ft

Shipwreck Volund
Type:
shipwreck, steamer, Norway
Built:
1889, Norway
Specs:
( 239 ft )
Sunk:
Sept 26, 1908; collision with liner Commonwealth
Depth:
105 ft

Shipwreck San Saba
Type:
shipwreck, steamer, USA
Name:
San Saba is a river in central Texas, a tributary of the Colorado River of Texas.
Built:
1879, Delaware River Iron Shipbuilding & Engine Works, Chester PA USA, as Colorado
Specs:
( 306 x 39 ft ) 2458 gross tons, 37 crew
Sunk:
Friday October 4, 1918
struck mine laid by U-117 - 30 casualties
Depth:
80 ft

LOST AT SEA:
A treatise on the management and ownership
of shipwrecks and shipwreck artifacts

by Michael C. Barnette

shipwreck Lillian

Somewhere out on the ocean, a ship is in distress. Tossed about by churning seas and brutal winds, the vessel struggles to stay afloat. Her crew puts forth a valiant effort while passengers, many incapacitated by waves of nausea spawned by the ever-moving deck underneath their feet, huddle together in fear. The hull is slowly breached, and seawater steadily invades the ship. As the blitzkrieg of flooding water rises to extinguish the boiler fires, the vessel loses all power. Cast in darkness and overwhelmed by the noise of the howling wind and crashing surf, the sea tears off sections of the crippled ship, carrying away numerous unfortunate souls. The end is near.