Problem: Asian carp eDNA has been detected upstream of the barrier in several locations. Although no
fish have been collected or seen on the lakeside of the barrier, the presence of eDNA strongly suggests that
fish may be present. In addition to random and systematic sampling throughout the system to detect Asian
carp, future sampling should also have a strategic and intensive component designed to seek and
destroy/capture Asian carp above the barrier.
Action: This action will include eDNA sampling in likely locations with rapid analysis of samples. Depending
on the season, likely locations will include areas adjacent to warmwater discharges, wastewater treatment
plant outfalls, tailwaters of locks and dams, marina basins, barge slips, and other slackwater areas. If
positive hits are encountered, the intent would be to concentrate and confine individuals into an area where
they would be susceptible to removal through toxicants or nets. Fish would be driven with electrofishing
gear and/or light/sound systems against lock and dam structures or into basins and inlets where they could
be confined with block nets and removed with rotenone. Commercial fishermen would also be deployed to
set block nets and trap fish within short segments of the waterway where they could then be driven into gill
and trammel nets or removed with rotenone. This effort will be conducted beginning in February and
continuing through November or until no further evidence of Asian carp is seen. This project could deploy
up to 15 conventional electrofishing boats and state/federal fisheries crews as well as multiple commercial
fishing companies. Costs also include rotenone and the detoxifying agent sodium permanganate,
substantial fishing gear of multiple types, and additional electrofishing rigs and crews beyond those already
available to state and federal agencies. Field work would be conducted by IDNR, USFWS, USACE, and
other state agencies who agree to participate.
2.1.4 Modified Structural Operations - Efficacy Study - Interim Report III
Lead Agency: USACE, USCG, MWRD, FWS, IL DNR, Chicago
Estimated Funding: NA
Funding Source: USACE Appropriation
Problem: Modified lock and attendant works (sluice gates and pumping stations) operations could impede
the opportunity for Asian carp to enter the Lake Michigan. All potential impacts must be considered to
ensure public health and safety, and the purposes of these structures are maintained as authorized in law.
Action: As part of the effort to address the threat that Asian carp pose to the Great Lakes, USACE intends
to assess the potential use of "modified structural operations" on the CAWS, in collaboration with agencies
that use the CAWS. "Modified structural operations" are defined as operating the locks and attendant works
of the CAWS such as sluice gates and pumping stations to impede Asian carp migration into the Great
Lakes consistent with public health and safety and maintenance of navigation. The potential impacts of
controlled operations, as well as the specific parameters of such operations, would be assessed and
understood under any applicable laws such as the National Environmental Policy Act prior to deciding to
proceed with implementation. Modified operations would be executed through a comprehensive plan, broad
collaborative participation and use of resources, integrated continuous management and decision-making,
and documented procedures agreed to by relevant agencies and effectively communicated to CAWS users.
Four general goals for modified structural operations:
• To ensure, to the fullest extent possible, that no Asian carp migrate into Lake Michigan
• To preserve emergency use of the CAWS, locks and structures, as well as other uses essential to
public health and safety
• To maintain navigation through the locks
• To modify operations and cooperate with vessel users as CAWS structures are changed.
Three phased approach
• Phase 1: Concept Development - Integrate agencies’ efforts to develop methods to suppress
Asian carp population growth while USACE and USCG simultaneously determine, after engaging
the navigation industry, how to optimize/reduce the number of lock openings, and MWRD
considers how to operate the Wilmette Pumping Station, to impede Asian carp movement. The
Asian Carp Control Strategy Framework
Draft – February 2010 16
goal for this phase is to complete concept development and recommend actions by early March
• Phase 2: Initial Implementation – Execute modified structural operations as quickly as possible
once methodologies are ready, with most elements underway by April 30, 2010. Some
methodologies currently under consideration include:
o Closing both sets of lock gates between lockages
o Reducing the frequency of lock openings by consolidating barge and recreation traffic
Four scenarios are being assessed, as follows:
-Alternative 1 – No action; Chicago and O’Brian Locks operate as normal
-Alternative 2 – Modified Structural Operations – Close each week; Chicago and O’Brian Locks open 3-4 days every week, a significant reduction from current “show and go” operations. Checking potential to place screens on the sluice gates and the lock gates during periods of closure.
-Alternative 3 – Modified Structural Operations – Close one week / month; Chicago and O’Brian Locks closed to navigation one week per month starting in April 2010.
-Alternative 4 – Modified Structural Operations – Close every other week; Chicago and O’Brian Locks closed to navigation two weeks per month starting in April 2010.
o Applying technologies to “herd” and reduce Asian carp populations that may be present,
to include rotenone
o Intensified and synchronized monitoring (eDNA, electro fishing, and netting).
• Phase 3: Additional Implementation – adjust initial methodologies based on field results for longer
sustainable operations. Continue to field new workable and appropriate methodologies as they
become available such as acoustic and electric barriers, as well as addition of screens to sluice
gates and bulkheads
One offical's response to the report:
"The complete absence of time lines and triggers for specific actions to be taken in response to specific events make evaluation of the framework's details difficult," Thom Cmar, a spokesman for the organization said in a statement. "But, we are concerned that the document released today still doesn't articulate a clear plan, based on the best available scientific information, that will actually work."
To read the full report please visit: http://www.asiancarp.org/RegionalCoordination/documents/AsianCarpControlStrategyFramework.pdf
Other Related yakangler articles:
The Great Asian Carp Invasion
A Case of Self Defense
The Carp Summit