North Fork TMDL
Fork – Lower Crow River and its tributaries have several
TMDLs on the state’s 303(d) impaired waters list.
Different stretches of the river or its tributaries are
listed for different parameters including: low oxygen,
turbidity, and fecal coliform. The North Fork TMDL
project focuses on the low oxygen and turbidity
impairments, and the main focus area of the study is
from the outlet of Lake Koronis in Stearns County to the
confluence of the Crow River with the Mississippi River
near Dayton. During Phase I of the project, it was
identified that the majority of dissolved oxygen
violations occurred during the summer under relatively
low flow conditions (Phase I Report - Brown and Caldwell
2008 Field Work Completed
2 began in spring of 2008. The Crow River
Organization of Water (CROW) is the local sponsor,
and Wenck Associates, Inc. is the consulting firm.
of travel studies were conducted in 2008, but
low/no-flow conditions limited the number of studies
able to be conducted.
Channel cross sections were surveyed for elevations.
Synoptic surveys for continuous dissolved oxygen (in
a 48-hour period) were conducted on Grove Creek,
Jewitts Creek, CD #31, Mill Creek and Regal Creek.
The data collected was used to construct and
calibrate a model (QUAL2K) that describes DO
impairments over all flow regimes.
quality samples were collected at 12 sites from
Litchfield to St. Michael throughout the summer
were measured at monitoring sites.
Field Work Completed
staff and volunteer Curt Oien conducted a sediment
erosion assessment on the mainstem NF Crow River
from Rockford to the confluence with the Mississippi
River. The entire reach was canoed to photograph and
GPS existing erosion sites that may contribute to
the turbidity impairment.
2009 additional monitoring and stream assessments
were conducted in the field.
Associates, Inc. has prepared a series of technical
memorandums that summarize the results of the
previously collected water quality and flow
Sediment fingerprint sampling will be conducted at 2
locations in the NF Crow to determine whether
sediment in the river comes from stream channel
erosion or from landscape runoff.
duration curves will be developed to describe flow
condition over wet to dry intervals.
Additional modeling, load allocations, the final
TMDL report and implementation plan will be
Turbidity Tech Memo
Bacteria Tech Memo
Dissolved Oxygen Tech Memos
Grove Creek (Meeker County)
Jewitts Creek (Meeker County)
County Ditch 31 (Wright
Regal Creek (Wright County)
North Fork Crow River TMDL Meeting Wright
County Court House, Buffalo
Meeting Room -
- 12:00 p.m., Tuesday, September 13, 2011
6:00 - 8:00 p.m. Wednesday, September 14,