2016

July Sept Nov Jan March May July Dec

Task 1 - Project Management

Task 2 - Survey/Data Collection

Task 3 - Permits and Clearances

Task 4 - Plans and Specifications

Task 5 - Construction Oversight

2015

Cons

truc

tion

2014

Lake Manawa Dredging Project ScheduleM I L E S T O N E C H A R T

Medium Effort Heavy EffortMinimal Effort

A S - B U I L T S U R V E Y

S U B M I T A P P L I C A T I O N S

P R O J E C T B I D

5 0 % P L A N S 9 0 % P L A N S F I N A L P L A N S

P R E - C O N

K I C K O F F M E E T I N G

Install breakwaters to reduce fetch and establish no-wake zones behind structures (typ)

Water Quality Plan³Lake Manawa Dredging Project

Iowa Department of Natural Resources

LegendExisting 1 ft ContoursProposed 10-15 ft DepthsProposed 15-25 ft DepthsBreakwaterFillGranular/Rock SubstrateUndisturbed Area

0 500 1,000250Feet

Deep excavation at theMosquito Creek outlet

Excavate deep pockets with steep slopes for fish habitat (typ)

Deepen main body to preventresuspension from wind and boating

Create deeper water within wetlandsfor fish habitat and boat access

Rebuild and protect bankline

Protect wind-surfing launch area

Inverted bowl excavation withgranular/rock substrate for underwater habitat (typ)

% Area0 to 5 16%5 to 10 30%

10 to 15 46%15 to 25 8%

~10 ft average depth ~4.7 millions CY dredged

RangeProposed Lake Depths