That same basic thing almost happened to me with my Ford 1720. It had been used on a very cold day dragging 40 foot long power poles out of a field where the power company installed a new run of poles, and I got the old poles. To get to the poles without having to go 40 miles out of my way I could simply transverse a small creek and be in the field in a matter mof minutes. The area I selecte dto make my crossing at was only about 12 to 14 inches deep. No problem, but after quite a few trips up and down the bank with the poles it was starating to get slick (lots of clay) and since I had to go down the one bank at an angle, on my last trip the tractor slid sideways down the bak, and I had no chooice but to try and recover, and wound up in the middle of the creek facing downstream instead of cross wise. The more I tried to get back up the other bank the stucker (is this a word?) I got, so I headed down stream a bit more, water got a bit deeper like about 3 feet or so, but the bank there was easy to get up. I got home, freezing cold and crawled in the house to warm up. The next day I relubed the front end and all looked ok. Tractor went unused for almost a month. I got on it and the thing would not respond to the clutch even though it felt like it was releasing etc. It turned out that the clutch facing was stuck to the pressure plate and flywheel, and all that was moving was me compressing the clutch and pressure plate springs but the cluch plate was bonded fast. I found this out after I split the tractor, and pulled off some clutch facing in the process of getting it unbonded. Just humidity or dampness can cause this on a cluct if its not used for a period of time. Later on I found in my owners manual that stated if tractor is not to be used for a period of time to install a spacer block (included in tools accessories that came with tractor, and nothingmore than a piece of wood with a string on it) between clutch pedal linkage and floor board to keep clutch face from adhering to pressure plate / flywheel.
Look around the tractors bell housing area for any plugs or openings etc that youy may be able to gain access to the clutchj facing edge with. My tractor has a drain hole in the bottom of the bell housing but it was fille dup with debri and never really left the bellhousing areas drain, and just enough water seeped in past the rubber plugs on the side to get the clutch wet. Now I leave the plugs out and enlarged the drain hole, so it always has ventilation.