Goals

Over time, dams and embankments built to create ponds and lakes blocked fish from returning to their spawning and nursery grounds. Restoring fish passage improves recreational and commercial fisheries, strengthens food sources for important predator species, and supports the overall health of the estuary ecosystem. 

Actions Taken

The EEP installed thirteen fish ladders in New Jersey and Delaware using the Alaska steep-pass design. These aluminum chutes are placed at a gentle slope and include internal baffles that slow the water, making it easier for fish to swim upstream. Bubbling water at the base attracts fish to the entrance. It usually takes several years after installation for river herring runs to begin re-establishing.

Accomplishments

The Fish Ladder Program has reopened access to upstream habitat by allowing fish to reach impoundments and miles of stream that were previously blocked. All ladders have successfully passed fish and have shown spawning occurring upstream. Over time, adult river herring have returned in increasing numbers, and the connected impoundments have provided healthy conditions for juvenile fish.

Continuing Activities

The program includes ongoing activities that help maintain long-term success, such as ensuring that fish ladders are operated during key migration periods each year. These efforts support continued fish movement, habitat access, and steady improvements in river herring populations.

Other Enhancements

By reconnecting waterways and restoring natural migration pathways, the Fish Ladder Program improves fish populations, strengthens biodiversity, and enhances the long-term resilience of the Delaware Estuary. It remains an important part of regional conservation and restoration efforts.