Performance record

Niagara River Emerald Shiner Fish Passage early performance evidence

USACE reports that construction measurements along the completed Freedom Park fish passage kept river-edge velocities below the emerald shiner swimming threshold. Staff also observed shiners moving through the 778-foot structure in the hundreds. The result supports the hydraulic design, while seasonal biological performance, formal structural acceptance and long-term durability remain unverified.

Evidence boundary: USACE reports a project-specific hydraulic measurement and early fish observations after construction. The public record omits the measurement dataset, formal acceptance, seasonal passage counts, population effects, structural condition history and independent ecological review.

Close view from above of a concrete-filled metal baffle fixed to the Niagara River seawall

U.S. Army photo by Kaylee Wendt via DVIDS, public domain

Verified record

Construction complete; initial hydraulic and biological observations reported in United States

Construction measurements and early fish observations support the hydraulic design criterion. Seasonal passage, structural acceptance, durability, and longer-term habitat outcomes require follow-up evidence.

Evidence level Reported Sources reviewed 5

Location

United States / Americas

Milestone or operating state

Construction complete; initial hydraulic and biological observations reported

Evidence conclusion

Early hydraulic and biological observations

Last updated

23 July 2026

Scope and limits

Evidence scope and limits

The 23 July 2026 USACE completion release confirms the combined 778-foot structure, May construction finish, measured velocities below the emerald shiner swimming threshold and observations of shiners using the passage. Earlier USACE releases establish the demonstration design, full-phase wall repairs and concrete-filled baffles. The reviewed sources do not publish raw hydraulic measurements, a completion certificate, independent fish counts, a representative monitoring period or post-winter condition evidence.

Confirmed

Supported findings

  • USACE reports the 700-foot full phase was constructed from March 2025 through May 2026 and the combined structure extends 778 feet.
  • The completion release says construction measurements confirmed water velocities below the emerald shiner swimming threshold.
  • USACE reports observing shiners moving through the structure in the hundreds and common terns hunting along the seawall.
  • The installed scope combines timber crib wall repair, steel plating, concrete and grout repairs, and concrete-filled metal baffles selected after the 78-foot demonstration.

Still unverified

Unverified outcomes

  • Raw velocity measurements, test locations, river conditions, acceptance thresholds and an independently reviewable hydraulic dataset.
  • Seasonal emerald shiner passage rates, comparison sites, population response and contribution to removal of the habitat beneficial-use impairment.
  • Formal structural completion, defect closeout, as-built geometry and acceptance of the wall repairs, steel plate and baffles.
  • Condition after freeze-thaw, ice, debris impact and high-flow exposure, together with funded inspection and maintenance responsibility.

Metric observations

Measurements and reporting gaps

Reported achieved

Hydraulic criterion

USACE says field measurements during construction kept velocities below the shiner swimming threshold, while the underlying measurement series is not public.

Initial observation

Fish passage

Shiners were observed moving through in the hundreds, but no seasonal count, control comparison or population trend has been published.

Completion reported

Structural delivery

The 778-foot combined structure and May 2026 construction finish are reported, while formal acceptance, as-built and defect-closeout records remain unavailable.

Evidence pending

Durability and maintenance

No post-winter inspection, repair history, condition rating or funded maintenance cycle is yet public for the wall repairs, steel plate and baffles.

Subject index

Related subjects

These subject pages bring together related projects, technical articles, reports, and evidence methods.

Related project evidence

The project page tracks the USD 13.4 million programme, Bidco Marine Group contract, 78-foot demonstration, 700-foot full phase and river-facing seawall scope. The companion brief explains why construction completion closes delivery but leaves biological and maintenance monitoring open.

Open project record Read related intelligence brief Explore performance evidence

Sources used

Source collections

Record limitations

The record is limited to the cited public evidence and does not confer certification, ranking, warranty, safety or environmental approval, recognition, or procurement endorsement.

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