Southwest Waterfront Marine Frequencies

I spent some time at the Southwest Waterfront on Monday, and monitored several marine frequencies in use for various boats/ships:

156.0500 [ CSQ] Spirit of Washington
156.1500 [ CSQ] Spirit of Mount Vernon
156.6250 [ CSQ] American River Taxi?
157.1250 [ CSQ] Odyssey?

The Odyssey is licensed for three UHF simplex frequencies, but nothing was heard on them. The Spirit of Mount Vernon has been monitored on 154.5700 [ 77.0] when it was docked in Alexandria. The Spirit of Washington/Spirit of Mount Vernon may also use 154.4900 (unknown tone).