The cache is not at the above coordinates. You will not need to be in the middle of the Santa Clara River to find it. The cache location has plenty of parking and should be fairly obvious once you figure out the coordinates and arrive at the cache location. You are looking for an Altoids container.
Although I have not lived in Colorado in almost 20 years I am still a huge Denver Bronco fan. This cache pays tribute to some of the great players that wore the Broncos uniform. At Invesco Field at Mile High the Level 5 facade pays tribute to some of the greatest players to ever wear the orange and blue. These players are members of the Denver Broncos Ring of Fame. To figure out the correct coordinates you will need to use something that defined each of the current Denver Bronco Ring of Fame members.
The cache can be found at the following coordinates:
N (Terrell Davis + 4) (Louis Wright+3).(((Billy Thompson + Craig Morton + Jim Turner + Haven Moses + Tom Jackson + John Elway)(4)) - 39)
W ((Paul Smith + Dennis Smith) -1) (Randy Gradishar + 2).(((Shannon Sharpe + Steve Atwater + Gary Zimmerman + Karl Mecklenburg)(3)) + 98)
Hope you enjoy the puzzle.
I added a coordinate checker to assist with the solution:
You can validate your puzzle solution with certitude.