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<br />3. Abutments <br /> <br />. Vertical wall with wing walls <br /> <br />. Footing supported on piles approximately 11,28 m (37 feet) <br />in length (elevation 410 feet) <br /> <br />. Bottom of footing was at elevation 446.7 feet <br /> <br />. A wall was built around footings after the stream degraded <br />1 ,83 m (6 feet) in the first 2 years after construction <br />(elevation unknown) <br /> <br />D. Step 18. Define stream characteristics. <br /> <br />1. Using geomorphic factors figure (Lesson 2), identify stream <br />characteristics. <br /> <br />2, Identification of these characteristics will help classify the channel <br />and will assist in subsequent assessment and evaluation, <br /> <br />3. A field reconnaissance is generally required to adequately define <br />stream characteristics. <br /> <br />NOTES: <br /> <br />4.8 <br />