2002-09-11 MNDPR Excavation
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1200 25th Avenue South, P.O. Box 1717, St. Cloud, MN 56302-1717 320.229.4300
320.229.4301 FAX
architecture
engineering
environmental
transportation
September 11, 2002
RE: Albertville, Minnesota
Mud Lake Outlet
SEHNo. A-ALBEV0301.00 D54 14
Patricia Fowler
Area Hydrologist
Minnesota Department of Natural Resources
940 Industrial Drive Suite 103
Sauk Rapids, MN 56379
Dear Ms. Fowler:
To supplement the City of Albertville's application to excavate within the outlet area of Mud Lake,
the following information is offered. Controlling the volume of water entering Otsego Creek is a
33" culvert that crosses 70th Street as shown on the enclosed map. On Wednesday, September 11,
2002, the culvert was observed to be flowing 1,4 full. At this rate and with the current weather
conditions this part of Wright County is experiencing, it will be nearly impossible for the lake level
to return to normal water elevation before winter freeze-up. If this happens, there may not be
adequate storage capacity for snowmelt next spring.
The calculated capacity of the 33" culvert is 30 cfs. At this discharge rate it will take approximately
17 days to draw down the water elevation from it's current elevation of 948.00 to the normal water
elevation of 945.00. This, of course, assumes no additional stormwater runoff. City staff has
observed the culvert flowing full in previous years and is not aware of any downstream problems.
Based on this previous knowledge, we are not anticipating any downstream problems with what is
being proposed.
Please call me if you have any additional questions.
Peter 1. Carlson, P.E.
Albertville City Engineer
mdh
Attachment
c: Mike Robertson, Otsego City Administrator
Ron Wagner, Otsego City Engineer
hHWaGoeb" Albefwil1e .CityA.dmi.:aistrator
Mike Couri, Albertville City Attorney
\\sehsc:JIsccv\albev1d54 mud lake outletll-fowler-091202.doc
Short Elliott Hendrickson Inc.
Your Trusted Resource
Equal Opportunity Employer
Assoc., Inc.
September 20, 2002
3601 Thurston Avenue, Suite 1 01 , Anoka, MN 55303---
Phone:763/427-5860 Fax:763/427-0520
PeteCarlson,P~E., Albertville City Engineer
SEH
12002Sth Avenue South
P.O. Box 1717
St. Cloud, MN 56302-1717
RE: Mud Lake Outlet Cleaning
Dear Mr. Carlson:
We received our copy of your explanation letter to the MNIDNR of your proposed work near the
outlet of Mud Lake. We understand the need for the proposed construction and do .not have any
objections as it being a emergency measure due to the highwater conditions that exist now.
However, we do have some concerns over the 33". culvert under 70th Street being used as the rate
control structure for flow out of Mud Lake. With all the existing and proposed development that
has and will take place within the Mud/School Lak~ Drainage Area a study must be completed
which determines the necessary type of control structure which would regulate the rate of flow
out of Mud Lake and intoOtsegoCreek.That study probably will determine thatthe proposed
clean'oui'was necessary for more than an immediate emergency measure. We believe the study.
will also conclude that a 33" culvert running unabated is not the long term solution' for rate
control and some other type of structure will be necessary.
We foresee a regulated outflow from Mud Lake which fluctuates less giving a more constant
flow inOtsego Creek This would allow for long 'periods of draw do"YIl providing storage. for the
next significant runoff event. If you have any questions you.maycontact meat (763) 427-5860.
Sincerely,
Hakanson Anderson Associates, Inc.
RJW:amr
cc: Mike Robertson, Otsego City Administrator
Judy Hudson, Otsego' City Clerk
Linda Goeb, Albertville City Administrator
Patricia Fowler, MNIDNR
Civil & Municipal
.. ... . . .. . . . Engineering
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