Allow me to explain Ft. Snelling State Park. There are about 5 areas that are totally different.
First, there's Historic Ft Snelling. Tourist attraction. Fort. It's on a high hill. No danger of flooding.
Second, there's Ft Snelling State Park where everyone goes. Paved trails along the Mississippi River, picnic benches, swim beach, park office. Paved trail goes to Minnehaha Park. Definitely flooded and closed.
Next is the Minnesota River part of Ft Snelling Park. Actually, this is where the cities of Bloomington, Burnsville, Eagan, and DNR land come together. Paved MN River Greenway is on the south side of the Minnesota River and partially on the north side (unfinished). Trail is from I-35 to I-77. Mountain bike trail also on the north side. You can bet 100% this is flooded and closed.
Next is the almost no man's land north of I-77. Unpaved trails on both sides of the Minnesota River. North side unpaved trail ends in Bloomington, south unpaved trail at Mendota (mostly). The unpaved mostly mountain bike trail, although next to the Minnesota River, is not very near where he disappeared. It' would be a walk through 1/2 mile+ swampy area with tall weeds from Highway 13 where his last call came from. Plans for the south side include a paved trail to connect to the I-77 bike bridge, but so far this trail ends at a nice parking lot at Lone Oak Rd, does not connect south, not connected to the area where he disappeared. Possible he could have found the paved trail but not likely. Paved trail there goes across 494 and/or connects to the Big Rivers Trail. Doubtful he made it that far. Area definitely flooded by the river but not along Highway 13 where he disappeared.
Finally, north of where Bryce disappeared are holding ponds and Gun Club Lake. About a hundred years or more ago Gun Club was a prime area for elite (wealthy) fishing. No more. Homeless, etc. often hang-out there. There are warnings to fishermen to be careful.
If he was in the Minnesota River (connects at Ft Snelling to the Mississippi River), his body, with flooding, would be perhaps many miles downstream. Most likely, as things dry out, searches are going to be on land near where he disappeared, perhaps holding ponds again. Everyone is mystified as to where to search. It's very strange he was not found immediately.