The 1969 Topo map shows a 10' (foot) contour elevation across the bed of the river near the Arcata Readimix site. There are two 1998 cross sections taken by Arcata Readimix, one upriver and one down river of the 1969 Topo map 10' contour mark. The cross sections show the elevation of the river at this area to be at or about 10'. The river in this area has not significantly degraded, consistent with the evidence at the REA culverts and the other lower Mad River locations. Clearly no significant bed degradation has occurred at this site.