Problem Cause Effect Aggregate Mining Decreased riparian vegetation Absence of large woody debris (LWD) Unstable/disrupted channel morphology Elevated stream temperatures Lack of summer/winter rearing refugia Decreased fish and aquatic insect productivity Illegal vehicle use in Compaction of substrate streambed Alters natural channel morphology Destruction of fertilized eggs and alevins Disturbance of juvenile/adult salmon Degraded Adult passage problems habitat Destruction of riparian vegetation Destruction of aquatic insect larvae Introduction of pollutants Decreased instream biotic productivity 1929 diversion dam Bedload entrapment Barrier to fish passage Decreased fish productivity Loss of riverine habitat due to infilling upstream of the dam Suspended sediment Decreased egg survival Decreased fish and aquatic insect productivity Low Eklutna Lake outlet dam Reduced flows and/or dewatering of in-stream and off-channel in-stream habitats throughout the year flows Insufficient sediment flushing flows Increased siltation and embeddedness of substrate Decreased egg survival Fry entrapment in substrate Increased stream temperatures Decreased fish and aquatic insect productivity Barrier to fish passage Decreased gravel input Former riverine habitats upstream of the dam permanently flooded by the lake Loss of meandering channel below the canyon primarily between the bridges Reduction in riparian habitat successional stage diversity and complexity Loss of year higher water quality (chemistry) flows through interstitial gravel/cobble habitat reducing incubating egg and alevin success Sediment Narrow railroad bridge Unstable/braided channel morphology entrapment Natural flood events Adult passage problems between Juvenile stranding bridges Dewatering of downstream habitat in winter Decreased LWD transport Decreased spawning area and potential Decreased bedload transport and throughput Decreased fish productivity Perched channel between the bridges Thunderbird gradient Increased stream velocity Human destruction of Decreased holding area riverbanks Decreased spawning area Decreased rearing area Absence of LWD Decreased fish productivity Restoration Opportunities.
Problem Cause Effect Degraded habitat Aggregate Mining Decreased riparian vegetation Absence of large woody debris (LWD) Unstable/disrupted channel morphology Elevated stream temperatures Lack of summer/winter rearing refugia Decreased fish and aquatic insect productivity Illegal vehicle use in streambed Compaction of substrate Alters natural channel morphology Destruction of fertilized eggs and alevins Disturbance of juvenile/adult salmon Adult passage problems Destruction of riparian vegetation Destruction of aquatic insect larvae Introduction of pollutants Decreased instream biotic productivity 1929 diversion dam Bedload entrapment Barrier to fish passage Decreased fish productivity Loss of riverine habitat due to infilling upstream of the dam Suspended sediment Decreased egg survival Decreased fish and aquatic insect productivity Low in-stream flows Eklutna Lake outlet dam Reduced flows and/or dewatering of in-stream and off-channel habitats throughout the year Insufficient sediment flushing flows Increased siltation and embeddedness of substrate Decreased egg survival Fry entrapment in substrate Increased stream temperatures Decreased fish and aquatic insect productivity Barrier to fish passage Decreased gravel input Former riverine habitats upstream of the dam permanently flooded by the lake Loss of meandering channel below the canyon primarily between the bridges Reduction in riparian habitat successional stage diversity and complexity Loss of year higher water quality (chemistry) flows through interstitial gravel/cobble habitat reducing incubating egg and alevin success Sediment entrapment between bridges Narrow railroad bridge Natural flood events Unstable/braided channel morphology Adult passage problems Juvenile stranding Dewatering of downstream habitat in winter Decreased LWD transport Decreased spawning area and potential Decreased bedload transport and throughput Decreased fish productivity Perched channel between the bridges Thunderbird gradient Human destruction of riverbanks Increased stream velocity Decreased holding area Decreased spawning area Decreased rearing area Absence of LWD Decreased fish productivity Restoration Opportunities.
Eklutna-River-Aquatic-Ecosystem-Restoration-Technical-Report-Nov.2011final.docx