FLOOD00789

• County: Larimer
• County: Weld
• Community: Larimer County, Weld County
• Stream Name: Boxelder Creek
• Title: Watershed Work Plan
• Date: 2/1/1971
• Prepared For: Larimer County
• Prepared By: USDA Soil Conservation Service
• Floodplain - Doc Type: Floodplain Report/Masterplan

Works of improvement

WORKS OF !MPRO\!lMNf m BIi I.%TALLED

and improving vegetative cover to reduce runoff and sedimentation.
Forest land treatment measures, both going and accelerated, will be
applied on private lands with technical assistance frorn the Colorado
State Forest Service in cooperation with and through the U. S. Forest
Service.

lAND TRFA'MNJ'

Land treatment measures shewn in table number 1 include those which are
needed and can be applied during the five-year installation period.
These measures will provide watershed protection and project benefits
through improved land and cover condition.
Land wners and operators in the watershed, with technical and/or finan-
cialassistancefrOlll; the Fort Collins and\l'est Greeley Soil Conserva-
tion Districts in Colorado, the Frontier and Laramie Rivers Soil and
Water Conservation Districts in Wyoming, the Great Plains Conservation
Program, the Agricultural Conservation Program, and the Colorado State
Forest Service and the WyOOling State Forestry Division in cooperation
with the U. S. Forest Service on the private and leased State land; have
applied land treatment measures listed in table lA, to reduce runoff
and erosion through improved watershed condition on the watershed land.
Private and Leased State Land

The major works of improvement will be fire control intensification in
Colorado through the Wellington Fire Protection District. Increased
protection will be for the entire Colorado portion of the Boxelder
Creek Watershed (14S,082 acres). Included will be a specially equipped
fire fighting vehicle of at least 2,000 gallon water capacity, a pump
for the existing tanker, modification of present fire house, and tech-
nical assistance.

The Colorado and Wyoming State Forest Service's District Foresters will
through regular programs encourage grazing control and management of
woodlands.

The Colorado Division of Game, Fish, and Parks will construct additional
ponds, food plots and protective ~'er for waterfowl and game birds in
the Wellington Wildlife Area.

Conservation and Great Plains Conservation plans developed by land
owners and operators with assistance from the Fort Collins and West
Greeley Soil Conservation Districts and the Frontier and Larll/llie Rivers
Soil and Water Conservation Districts will designate land treatl!\ent
lrK)asures needed on each fann and ranch unit. Land treatment measures,
both going and accelerated will be applied on private and leased State
lands with technical assistance frOll the Seil Conservation Service.
Measures to be applied on the irrigated land will include conservation
cropping system, crop residue use, irrigation pipeline and ditch lining,
irrigation land leveling, irrigation water management, structures for
water control, drainage main or lateral, and wildlife habitat management.
Measures to be applied on the non-irrigated land will inClude conserva-
tion cropping system, stubble mulching, pasture planting, and pasture
management.
Measures to be applied on rangeland will include proper grazing use,
deferred grating, ponds, debris basins, spring developments, and brush
control.

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Through conservation plans developed with land owners and operators and
the Soil Conservation and Soil and Water Conservation Districts, food
and protective cover plantings will be encouraged on farm and ranchland
for wildlife.

No new land will be brought into agricultural production. Some 10<:;<:;
of agricultural acreage to residential and conrnercial development 1'1'111
occur regardless of the effects of the project.
A soil survey for Larimer County is being made and is scheduled for
completion of field mapping in 1972.

STRUCItlRAL~<;

The hydrologic condition of forest and brosh-covered land in Wyoming
is satisfactory and accelerated forestry-fire measures are not required.
The WyOll\ing State Forester will continue to provide technical services
for the watershed area through regularcooperati\Ce forestry programs.
In Colorado emphasis will be placed on continued hydrologic improvement
of existing forest and brush-covered ~ands and prote<:tion from fire loss
and excessive grazing pressure. Activity will aim toward maintaining

Project structural measures consist of five single.purpose floodwater
retarding structures and one grade stabilization structure located on
Boxelder Creek and its tributaries. There will be no permanent storage
of water in the sediment pools. The structures retard runoff fran a
combined area of 17S. S square.miles or 70 percent of the watershed. In
addition 1l.4 square-miles are controlled by the existing Round flutte
Reservoir above Structure 8-3 for a total of 186.9 square-miles or
74.5 percent of the watershed. Structures B-S and B-6 are upstream and
in series with structure B-2. The structures have a designed life of
lOO years. See the Project Map for structure locations and the area
controlled. Figures 1 through 10 show pertinent data relating to each
structure. Estimated costs are shawn in tables 1 and 2. Structural
data is shOWl\intables 3 and 3B.

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