Two Brothers Up-and-Down

Big brother is 10km, up-and-down 1,800'. Baby Brother is 5k, up-and-down 570'. The first and last 0.8mi are paved. The upper 2.3mi of the Big Brother is on a steep, 2wd, dirt road, with an average gradient of 12% and sections > 15%. The upper 3/4mi of the Baby Brother is on a fairly smooth, dirt road, with an average gradient of ~6-7%. Starts/finishes at the river crossing by 23rd & Colorado, next to Courtney-Ryley-Cooper Park.