Styx
If you are talking about the Charles Bridge in Prague, the river is the Vltava.
Yeah, done that one too. Many times. Also the Aare in Bern, Switzerland.
Mississippi and pretty much every river between it and the Atlantic, also every river on the Gulf Coast between it and Houston.
I once illegally swam into Mexico from Big Bend, so I guess I can cross the Rio Grande off the list 
Merrimack (NH, MA) many, many times.
Pemigewassett (NH)
Winnipesaukee (NH)
Salmon Falls (NH, ME)
Piscataquog (NH) Many times
Piscataqua (NH, ME) often
Do they get confused with one another? No not at all :rolleyes:
Mississippi
Missouri
Ohio
Tennessee
Snake
Columbia
Colorado
St. Lawrence
Niagara (NY, ON)
Detroit (MI, ON)
Chicago (IL)
Hudson (NY)
Harlem (NY)
East (NY)
Passaic (NJ)
Hackensack (NJ)
Raritan (NJ)
Delaware (NY, PA, NJ, DE)
Susquehanna (PA, MD)
Potomac (WV, MD, VA, DC)
James (VA)
Connecticut (CT, MA, NH, VT)
Housatonic (CT)
Thames (CT)
Quinnipiac (CT)
Penobscot (ME)
Saco (NH, ME)
Androcscoggin (ME)
Kennebec (ME)
Charles (MA)
Savannah (GA, SC)
St. Johns (FL)
Let’s see…
N. America:
Brazos
Trinity
San Jacinto
Colorado
San Antonio
Guadalupe
Frio
Hudson
East River (does it count?)
Missouri
Mississippi
Charles
Mystic (on a train)
Saugus (on a train)
Chattahoochee
Red River
Kansas
Cimarron
Petaluma
Elsewhere:
Thames (London)
Vltava (Prague)
Danube (Budapest)
Seine (Paris)
Cherwell (Oxford)
Cuale & Ameca Rivers (Puerto Vallarta)
Cam (Cambridge)
Humber/Ouse/Trent (somewhere on the way to York)
Tyne & Tweed (on way to Edinburgh)
Tay, Dee & Don (on way to Aberdeen & nearby)
Spey
Avon (both the English and Scottish ones)
Dee (outside Chester)
Tiber (Rome)
Arno (Florence)
That’s all I can think of- there are certainly more that we drove across and I just don’t recall or that I didn’t spot on the maps.
Detroit River both over and under
Mississippi
Potomac
Niagara
Ohio
Statewise, off the top of my head:
Alaska (excluding the Yukon and Copper, already mentioned):
Susitna
Little Susitna
Montana
Willow
Matanuska
Knik
Portage
Kenai
Russian
Twenty Mile
Tanana
Nenana
Chena
Nabesna
Eklutna
Eagle
Chilkat
Oregon:
Willamette
Columbia
John Day
Hood
Deschutes
Clackamas
Coos
Rogue
I’ll stop there, as this could get very lengthy.
River crossings others have not posted yet
Magadalena (Colombia)
Rio Otún (Colombia)
Holston (TN - major tributary of the Tennessee River)
French Broad (NC - joins the Holston to form the Tennessee River)
Avon derives from the ancient British word for river; * abona*, so you’ve crossed the River River.
Carry on.
As I’ve been in every state of the union except MS and AL, I think I must have crossed ever major river in the US except any Alaskan rivers outside the panhandle. I’ve also crossed the Vancouver River and the Fraser River in BC and the St Lawrence and Niagara Rivers in Ontario. I must have crossed every river in Newfoundland (excluding Labrador), but I don’t recall any major rivers there.
In Europe I’ve crossed, the Thames, the Seine, the Tiber, the Danube, and any rivers you’d cross on a train from Paris to Copenhagen, Malmo to Stockholm, or Stockholm to Bergen through Oslo.
Hudson
Mohawk
Schroon
Charles
Niagara
Connecticut
Potomac*
Delaware
St. Lawrence
Thames (in CT)
Thames* (in the UK)
Peconic
Seine*
St. John River*
Chicago
Savannah
Roanoke
East Branch Croton River
Schoharie Creek
Susquehanna
*On foot
Just like Patton, I pissed in the Rhine.
Major Rivers outside of US:
Tigris
Thames
Rhine
Danube
Elbe
Mosel
Seine
Main
Inside:
Delaware
Hudson
East
Harlem
Raritan
Mississippi
Ohio
Potomac
James
Charles
St Lawrence
I’m sure there are a few major ones I missed.
Yeah, me too.
The only ones I thought were important was the first time I crossed the Mississippi and the first time I went under the Hudson. (Lincoln Tunnel when I moved to NYC.
Many many. There is a creek in Southern Germany called Donaueschingen that is, I have always assumed the source of the Danube, so I can count that.
Switzerland: Limmat, Sihl, Aare, Saane
England: Thames, Cam, doubtless others
Canada: St. Lawrence, Riviere des Prairies, Thames, Detroit, …
US: Delaware, Schuylkill, Hudson, East, Harlem, Susquehanna (crossed many times over the Conowingo Dam), Ohio, Chicago, James (VA), Charles (MA), Mississippi, Columbia, many others
and, in the ante-google days, I walked halfway across the Golden Gate bridge–and back–in the company of Sergei Brin. Just thought I’d add that.