Dredging Strategy

Petaluma's completed dredge exposes survey, crew-boat and placement-fee layers

Published 11 August 2026 Updated 16 August 2026 Publisher IMWO Region Americas Confidence Confirmed
Aerial visualization of the Petaluma River dredging spread, material scow, survey support and crew boat

IMWO artist's impression accompanying this evidence brief

USACE marks FY2025 Petaluma River maintenance dredging complete and lists three post-dredge survey dates through 11 December 2025. USAspending adds a lower-tier view: The Dutra Group holds the USD 6,272,317 prime contract, Montezuma Wetlands has a USD 715,053 tipping-fee record, Woolpert has USD 84,189.18 for DQM, surveys and tug setup, and Niemeth Pacific has USD 76,800 for crew boats.

Completion evidence now connects to a named lower-tier chain

USACE reports completion and gives the channel geometry, sponsor role and survey dates. USAspending identifies the prime and three reported lower-tier parties with their descriptions, dates and values. The March 2025 procurement plan's 200,000 cubic yards is a pre-award estimate, not an accepted total. The cited records do not publish the final pay quantity, complete placement split, equipment list or final account.

Placement fees and survey support reveal different responsibilities

Petaluma's lower-tier records separate three operating interfaces below Dutra: placement-site fees, control and setup, and marine access for personnel. Each line changes supplier attribution without expanding the delivery claim. Tipping fees do not prove an accepted volume, while DQM plus tug setup neither identifies the dredge nor grants Woolpert full survey responsibility.

Evidence conclusion

The chain is useful only if each description stays narrow

USACE's completion statement and post-dredge hydrography support the campaign's completed classification. The 200,000 cubic yards remains a March 2025 planning estimate, not the final pay quantity. The three subaward values are reported award records rather than a complete or paid subcontract ledger. The June 2026 condition survey belongs to post-campaign monitoring and is not evidence of a new dredging award or a defect finding without interpretation from USACE.

Outstanding evidence

  • Final pay quantity and accepted placement-volume split
  • Dredge, scows, tugs and survey plant used in FY2025
  • Whether Montezuma Wetlands publishes a project-specific accepted volume
  • Contract modifications, payments and final account
  • USACE interpretation of the June 2026 condition survey
  • Next Petaluma River maintenance cycle and procurement
  • Additional or corrected project-level subaward records

Related records 1

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