The Cedar River is closed from river mile 4.5 to 13.5 due to several downed logs spanning the corridor and blocking safe passage. Those logjams create hazards for recreationalists and habitat for fish — a policy puzzle King County is currently working to address.
When Terry started, LiDAR – aerial imagery that uses laser to map river-basin topography – didn’t exist. Nor were GIS – Geographic Information Systems – or, for that matter, high-tech sonar-based river surveys in widespread use.
King County ecologists document species prior to river construction projects to plan for protection and relocation efforts, if necessary.