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The channel top width varies from about 60 feet to 160 feet. In the vicinity of Fort Collins, the channel gradient varies from 28 feet per mile to 16 feet per mile and the channel averages 160 feet wide and 7 feet deep. . In the mountains, from Spencer Heights to the canyon mouth, the Cache la Poudre River generally slopes about 60 feet per mile. The channel is about 100 feet wide and is flat-bottomed with steep banks generally 5 to 15 feet high or sometimes higher. The bed material is usually coarse, ranging from gravel to boulders. Upstream from Spencer Heights, slopes reach 100 feet per mile on the main stem. On the North Fork Cache la PDudre River, stream gradients are abDut 28 feet per mile from the mDuth to Livermore and 60 feet per mile from the vicinity of Livermore to Halligan Reservoir. The Cache la Poudre River valley ranges from about 0.5 mile to 1.5 miles wide in the plains, From the canyon mouth to Spencer Heights, the valley is narrow and ranges from about 200 to 1,500 feet in width, Upstream from Spencer Heights, the valley narrows tD as little as 100 feet, The Cache la Poudre River valley in the mountains is bordered by steep bluffs several hundred feet high. The valley Df theNDrth Fork is generally Dnly a few hundred feet wide downstream from Halligan Reservoir, although it widens to about 1 mile in the vicinity Df Livermore, FIDOd Plain Widths. In the plains, the Cache la Poudre River flood plain ranges from about 3,000 to 6,000 feet in width; it narrows upstream from Fort Collins to 500 feet near the canyon mouth. In the mDuntains the flood plain is only a few hundred feet in width, The flood plain Df Boxelder Creek, the largest tributary in the plains area of the basin, is several hundred feet wide along the upper reaches and over 3,000 feet wide from Wellington to the confluence with 30 .