Gross Dam Quick Facts
Gross Dam Map
Gross Dam Information
Gross Dam is a concrete arch gravity dam located about 7 miles from Eldorado Springs, Boulder, Colorado.
The dam, which is on the South Boulder Creek River, was primarily built for Hydroelectric purposes, but also serves for Water Supply benefits.
The dam was designed by and commissioned in 1955 and is currently owned by Denver Water.
Gross Dam Structure
The Gross Dam is approximately 1,050 feet (320 m) long, 340 feet (104 m) high and has a structural volume of cubic yards (0 cubic metres).
Gross Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 41,000 acre-ft (50,573 Ml) and maximum capacity of 46,200 acre-ft (56,987 Ml).
The surface area of the reservoir is 413 acres (167 ha) and the total catchment area is 93 square miles (240 square kilometres).
Gross Dam Spillway
The dam has a 7280 feet (2219 m) wide uncontrolled spillway with a maximum discharge capacity of 10000 cubic feet per second (283 cubic metres per second).
Gross Dam Compared to Five Famous American Dams
Gross Dam Weather
Current Conditions at Gross Dam
| Parameter | Value |
|---|---|
| Current Time | 22:14 |
| Sunrise | 07:12 |
| Sunset | 18:21 |
| Temperature (°F) | 43 |
| Feels Like (°F) | 43 |
| Cloud Coverage (%) | 0 |
| Pressure (inHg) | 1023 |
| Humidity (%) | 53 |
| Wind Speed (mph) | 0 |
| Rain (mm) | 0 |
7-Day Forecast for Gross Dam
| Day | Min Temp (°F) | Max Temp (°F) | Feels Like (°F) | Pressure (inHg) | Humidity (%) | Wind Speed (mph) | Wind Gust (mph) | Wind Dir | Precip Prob (%) | Precip Volume (mm) | Weather |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Today | 43 | 62 | 59 | 1021 | 29 | 11 | 11 | W | 0 | - |  |
| Wed | 44 | 66 | 64 | 1013 | 23 | 12 | 20 | WNW | 100 | 2 |  |
| Thu | 43 | 60 | 56 | 1005 | 28 | 13 | 24 | WSW | 93 | 1 | |
| Fri | 38 | 61 | 56 | 1002 | 25 | 16 | 22 | SSE | 0 | - |  |
| Sat | 30 | 35 | 31 | 1020 | 96 | 9 | 7 | W | 100 | 5 |  |
| Sun | 26 | 45 | 43 | 1014 | 47 | 13 | 25 | WSW | 34 | 0 | |
| Mon | 33 | 58 | 51 | 1015 | 38 | 13 | 29 | WSW | 0 | - |  |
| Tue | 39 | 61 | 56 | 1018 | 30 | 11 | 21 | W | 0 | - | |
Gross Dam Frequently Asked Questions
Gross Dam is in Colorado.
Gross Dam is in Boulder County.
Gross Dam is 340 feet high.
Gross Dam is 1,050 feet long.
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Gross Dam
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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