Culmback Dam Quick Facts
Culmback Dam Map
Culmback Dam Information
Culmback Dam is a rockfill dam located about 16 miles from Sultan, Wa, Snohomish, Washington.
The dam, which is on the Sultan River, Skykomish River, was primarily built for Hydroelectric purposes, but also serves for Recreation, Water Supply and Flood Risk Reduction benefits.
The dam was designed by R.W. BECK & ASSOCIATES and commissioned in 1983 and is currently owned by PUD #1 of Snohomish County, WA.
Culmback Dam Structure
The Culmback Dam is approximately 640 feet (195 m) long, 262 feet (80 m) high and has a structural volume of 740,000 cubic yards (565,771 cubic metres).
Culmback Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 153,260 acre-ft (189,043 Ml) and maximum capacity of 193,440 acre-ft (238,604 Ml).
The surface area of the reservoir is 1,870 acres (757 ha) and the total catchment area is 68 square miles (176 square kilometres).
Culmback Dam Spillway
The dam has a 92 feet (28 m) wide uncontrolled spillway with a maximum discharge capacity of 57132 cubic feet per second (1618 cubic metres per second).
Culmback Dam Compared to Five Famous American Dams
Culmback Dam Weather
Current Conditions at Culmback Dam
| Parameter | Value |
|---|---|
| Current Time | 20:37 |
| Sunrise | 07:26 |
| Sunset | 18:17 |
| Temperature (°F) | 52 |
| Feels Like (°F) | 51 |
| Cloud Coverage (%) | 100 |
| Pressure (inHg) | 1016 |
| Humidity (%) | 97 |
| Wind Speed (mph) | 2 |
| Rain (mm) | 0 |
7-Day Forecast for Culmback 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 | 50 | 54 | 51 | 1018 | 100 | 4 | 4 | WSW | 100 | 3 |  |
| Wed | 40 | 51 | 44 | 1014 | 91 | 6 | 13 | SW | 100 | 28 | |
| Thu | 36 | 43 | 39 | 1015 | 98 | 4 | 7 | E | 100 | 14 | |
| Fri | 36 | 49 | 46 | 1026 | 73 | 5 | 7 | E | 0 | - |  |
| Sat | 43 | 50 | 46 | 1022 | 97 | 6 | 9 | ESE | 100 | 35 | |
| Sun | 43 | 49 | 46 | 1020 | 93 | 4 | 7 | W | 100 | 14 | |
| Mon | 39 | 47 | 46 | 1022 | 85 | 4 | 4 | ENE | 100 | 7 | |
| Tue | 36 | 50 | 45 | 1023 | 77 | 4 | 4 | W | 0 | - |  |
Culmback Dam Frequently Asked Questions
Culmback Dam is in Washington.
Culmback Dam is in Snohomish County.
Culmback Dam is 262 feet high.
Culmback Dam is 640 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