Hendrickson Dam; Alan 2 dam
Hendrickson Dam; Alan 2
Hendrickson Dam; Alan 2, also known as Wetland 1, is a privately owned structure located in Dunn, North Dakota. Constructed in 1998, this Earth-type dam serves primarily as a Fish and Wildlife Pond with a storage capacity of 81 acre-feet. The dam stands at a height of 10 feet and stretches 365 feet in length, covering a surface area of 13 acres and draining an area of 4.3 square miles.
Managed by the North Dakota State Water Commission (NDSWC), Hendrickson Dam; Alan 2 has a low hazard potential and a moderate risk rating. The dam features an uncontrolled spillway with a width of 75 feet and is equipped with a single vertical lift outlet gate. Despite its condition being labeled as 'Not Rated' in terms of assessment, the structure is subject to regular state inspection, permitting, and enforcement to ensure its safety and compliance with regulatory standards.
For water resource and climate enthusiasts, Hendrickson Dam; Alan 2 offers a fascinating example of how private initiatives contribute to wildlife conservation and habitat preservation. The dam's role as a Fish and Wildlife Pond not only provides essential water storage but also creates a thriving ecosystem for local flora and fauna in the Knife-TR river basin. With proper management and oversight, this structure serves as a valuable asset in maintaining ecological balance and supporting biodiversity in the region.
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 Hendrickson Dam; Alan 2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Knife River At Manning | 1 cfs | → |
| Knife River Nr Golden Valley | 10 cfs | → |
| Spring Creek At Zap | 14 cfs | → |
| Green River Nr New Hradec | 3 cfs | → |
| Heart River Nr South Heart | 3 cfs | → |
| Heart River Nr Richardton | 13 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hendrickson Dam; Alan 2.
Boat launches
- Lake Ilo Boating Access
- Little Missouri Boat Ramp
- Dunn County
- Mercer County
- 30th Avenue Southwest Stark County
- Beaver Creek Bay Boat Ramp
Campgrounds
- Lake Ilo - Nd Gfd
- Killdeer City Park
- Little Missouri Sp - Eastview Cg
- Schnell Recreation Area
- Camp Site 1
- Camp Site 2
Paddle runs
- Southern Boundary Of The South Unit Of Theodore Roosevelt National Park To Northern Boundary Of The South Unit Of Theodore Roosevelt National Park
- Northern Boundary Of Knife River Indian Villages National Historic Site To Southern Boundary Of Knife River Indian Villages National Historic Site
- Southern Boundary Of The Elkhorn Unit Of Theodore Roosevelt National Park To Northern Boundary Of The Elkhorn Unit Of Theodore Roosevelt National Park
Track Hendrickson Dam; Alan 2 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 Hendrickson Dam; Alan 2
Where does the data for Hendrickson Dam; Alan 2 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 Low 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 Hendrickson Dam; Alan 2.