Bridges 7 Clovis culture 1 Clovis points 1 Culverts 1 Design and construction 2 Ecological mapping 1 Environmental aspects 5 Environmental impact statements 2 Fishes 1 Fishways 1 Freshwater habitats 1 Highway engineering 1 Highway planning 2 Marine animals 1 Migration 1 Paleoecology 1 Planning 1 River surveys 1 Roads 5 Salmonidae 1 Standards 1 Underwater tunnels 1