Quick Facts About Lake Ponderosa Dam
Lake Ponderosa Dam Map
Lake Ponderosa Dam Information
Lake Ponderosa Dam is an earthen embankment dam located about 16 miles from Spring Valley, Poweshiek, Iowa.
The dam, which is on the Tr-Moon Creek River, was primarily built for Other purposes, but also serves for Recreation benefits.
The dam was designed by THOMPSON WILLIS & CO. and commissioned in 1969 and is currently owned by Poweshiek County Board of Supervisors.
Lake Ponderosa Dam Structure
The Lake Ponderosa Dam is approximately 1,090 feet (332 m) long, 50 feet (15 m) high and has a structural volume of 148,824 cubic yards (113,784 cubic metres).
Lake Ponderosa Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 2,500 acre-ft (3,084 Ml) and maximum capacity of 5,850 acre-ft (7,216 Ml).
The surface area of the reservoir is 290 acres (117 ha) and the total catchment area is 7 square miles (17 square kilometres).
Lake Ponderosa Dam Spillway
The dam has a 4 feet (1 m) wide uncontrolled spillway with a maximum discharge capacity of 0 cubic feet per second (0 cubic metres per second).
Lake Ponderosa Dam Compared to Four Famous American Dams
| Lake Ponderosa Dam Poweshiek, Iowa |
Hoover Dam Clark County, Nevada |
Grand Coulee Dam Okanogan County, Washington |
Theodore Roosevelt Dam Maricopa County, Arizona |
Glen Canyon Dam Coconino County, Arizona |
|
|---|---|---|---|---|---|
| Height (ft) | 50 | 730 | 550 | 357 | 216 |
| Length (Ft) | 1,090 | 1,244 | 5,673 | 6,920 | 1,565 |
| Storage Volume (acre-ft) | 5,850 | 30,237,000 | 9,562,000 | 3,540,000 | 29,875,000 |
| Drainage Area (sq miles) | 7 | 167,800 | 74,100 | 3,611 | 108,355 |
Lake Ponderosa Dam Weather
Current Conditions at Lake Ponderosa Dam
Failed to fetch current weather data.7-Day Forecast for Lake Ponderosa Dam
Failed to fetch weather forecast data.Lake Ponderosa Dam Frequently Asked Questions
Lake Ponderosa Dam is in Iowa.
Lake Ponderosa Dam is in Poweshiek County.
Lake Ponderosa Dam is 50 feet high.
Lake Ponderosa Dam is 1,090 feet long.
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Condition Assessment Classification
Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor
A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner’s property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Source: National Inventory of Dams