Project record

Duwamish Waterway FY2026 maintenance dredging

Participation
Not assessed
Project facts checked

USACE awarded the USD 2.852 million contract to American Construction on 24 September 2026; dredging is scheduled no sooner than 1 December and mobilisation remains unreported

Project sources

Seattle District awarded contract W912DW26CA038 to American Construction Co., Inc. for USD 2,851,950 on 24 September 2026. The announced mechanical campaign covers up to 140,000 cubic yards from shoaled areas in the Duwamish Waterway turning basin, section A and section B between stations 242+00 and 275+56. USACE expects continuous clamshell dredging no sooner than 1 December, with material routed to the Elliott Bay open-water disposal site. The award and planned scope are public, but mobilisation, plant assignment, measured production, disposal receipts, post-dredge hydrography and acceptance remain unreported.

USACE maintenance dredging map of the Duwamish Waterway federal navigation channel base and option areas with the Elliott Bay disposal site inset

Graphic: Abigail Chipps / U.S. Army Corps of Engineers, Seattle District via DVIDS (public domain, 2 October 2026)

Location

United States / Americas

Segment

Navigation channel maintenance dredging

Phase

Award / Confirmed

Last checked

6 October 2026

Coverage

Related sectors

Navigation channel maintenance dredging is the primary work classification. Related sectors connect this record to adjacent marine delivery and market coverage.

Subject index

Related subjects

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

Project anatomy

Contract scope and delivery roles

Client / authority
U.S. Army Corps of Engineers, Seattle District
Delivery parties
American Construction Co., Inc.
Contract route
USACE awarded definitive contract W912DW26CA038, following solicitation W912DW26BA011, to American Construction Co., Inc. on 24 September 2026. SAM.gov reports a USD 2,851,950 base-and-options value, a total small-business set-aside, NAICS 237990 and PSC Y1KF. The public award notice does not disclose the bid count, line-item prices, option split, modification history or final account.
Execution window
The Seattle District release says dredging will begin no sooner than 1 December 2026, operate continuously 24 hours per day and conclude all in-water work no later than 1 March 2027. The earlier SAM.gov solicitation described a 1 December 2026 to 15 February 2027 dredging window. The later release controls the current public operating statement, but the difference requires contract-document or owner clarification.
Works package
Mechanical clamshell dredging of up to 140,000 cubic yards from shoaled areas of the federal turning basin, section A and section B between stations 242+00 and 275+56, followed by transport to and open-water placement at the Elliott Bay disposal site. The published map distinguishes base and option work areas but does not assign public quantities or prices to each line item.
Marine interfaces
The work combines clamshell excavation, barge loading and a transit from the Duwamish federal channel to the Elliott Bay open-water site while the channel remains open. USACE calls for 24/7 operations and asks fishing, crabbing and recreational users to keep boats and gear at least 300 feet from the channel and placement boundaries. Navigation separation, debris, water quality, tribal fishing coordination, salmonid and forage-fish restrictions, weather and disposal-site controls are therefore part of the delivery boundary.
Commercial evidence boundary
The USD 2,851,950 figure is the SAM.gov base-and-options value and the amount shown in the USACE DQM award register. This figure does not represent a certified final cost, paid quantity or unit-rate basis. The 140,000-cubic-yard figure is an upper planned quantity, and the public map's base-and-option labels should not be converted into exercised scope without the contract schedule or later USACE confirmation.

Contract and delivery chain

Work packages and named roles

Published scope, named parties and supporting evidence for each workstream.

Award

W912DW26CA038

Named party
American Construction Co., Inc.
Evidence status
Confirmed
Source position
SAM.gov and the USACE DQM register report a 24 September 2026 award with a USD 2,851,950 base-and-options value. Source
Dredging scope

Turning basin, section A and section B

Named party
American Construction Co., Inc.
Evidence status
Confirmed
Source position
Seattle District announces mechanical clamshell dredging of up to 140,000 cubic yards between the identified federal channel work areas. Source
Material placement

Elliott Bay open-water disposal site

Named party
USACE and campaign delivery parties
Evidence status
Confirmed
Source position
The release and map establish Elliott Bay as the planned route; no delivered loads or disposal receipts are yet published. Source
Field delivery and close-out

W912DW26CA038

Named party
U.S. Army Corps of Engineers, Seattle District and American Construction Co., Inc.
Evidence status
Not evidenced
Source position
The reviewed public chain does not establish mobilisation, assigned plant, measured production, disposal loads, post-dredge surveys, demobilisation, acceptance or final account.

Project timeline

Material developments

Dated events that changed scope, counterparties, delivery, commissioning or operating status.

Open this project in the Change Log

Seattle District published the field and placement plan

The release connects the awarded contractor to an upper 140,000-cubic-yard clamshell scope, 24/7 operations and Elliott Bay placement while leaving actual mobilisation and production open.

Source

USACE awarded Duwamish contract W912DW26CA038

The official federal notice records American Construction as awardee at USD 2,851,950 under a total small-business set-aside procurement.

Source

Evidence gap

What remains unverified

Outstanding evidence

  • Issued contract line-item schedule and exercised option boundary
  • Reconciliation of the 15 February and 1 March 2027 in-water dates
  • Named floating crane, bucket, scows, dump barges and tug spread
  • Dated mobilisation and continuous-operation start
  • Daily and cumulative quantities by turning basin, section A and section B
  • Elliott Bay disposal loads and environmental compliance records
  • Post-dredge hydrography, demobilisation and USACE acceptance
  • Modification ledger, final paid quantity and final contract value

Related records 3

Reporting status

Project phase
Award
Evidence confidence
Confirmed
Last checked
6 October 2026
Cited sources
5

Sources and related records

Project changes Methodology Email a correction Project tracker
Source collections

Project sources 5