Reservoir 140 dam
Reservoir 140
Reservoir 140, also known as Upper Field 3 Reservoir, is a privately-owned water storage structure located in Honokowai, Maui, Hawaii. Built in 1926 for irrigation purposes, this earth dam stands at a height of 35 feet and has a storage capacity of 53.3 acre-feet, with a normal storage level of 43 acre-feet. With a surface area of 3.3 acres and a drainage area of 0.01 square miles, Reservoir 140 plays a crucial role in supporting agriculture in the region.
Despite its age, Reservoir 140 remains in fair condition with a high hazard potential, prompting regular inspections every five years. The dam features an uncontrolled spillway with a width of 23 feet, capable of releasing a maximum discharge of 340 cubic feet per second. The structure is regulated by the Department of Land and Natural Resources (DLNR) in Hawaii and is deemed to meet moderate risk assessment guidelines. As a key component of the local water resource infrastructure, Reservoir 140 underscores the importance of sustainable water management practices in the face of climate variability and changing hydrological conditions.
Water resource and climate enthusiasts can appreciate Reservoir 140 for its historical significance and ongoing role in supporting agricultural activities in Maui. As a vital part of the water supply system in the region, this reservoir serves as a reminder of the importance of maintaining and monitoring aging infrastructure to ensure water security and resilience in the face of evolving climate challenges. With its unique design features and regulatory oversight, Reservoir 140 stands as a testament to the intersection of human ingenuity and environmental stewardship in managing water resources for future generations.
Dam data reference
Condition Assessment
- 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.
- 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.
- 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.
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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Reservoir 140 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Honokohau Stream Near Honokohau | 28 cfs | → |
| Kahakuloa Stream Near Honokohau | 17 cfs | → |
| Waihee River At Dam Near Waihee | 55 cfs | → |
| Iao Stream At Kepaniwai Park Nr Wailuku | 87 cfs | → |
| Halawa Stream Near Halawa | 15 cfs | → |
| Kaunakakai Gulch At Altitude 75 Feet | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Reservoir 140.
Campgrounds
- Camp Olowalu - Maui
- Camp Olowalu
- Papalau Camping
- Maybe Camping
- Chemin Vers La Côte
- Kanaha Beach Park - Maui
Track Reservoir 140 in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Reservoir 140
Where does the data for Reservoir 140 come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the High hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Reservoir 140.