Holter Dam is a hydroelectric straight gravity dam on the Missouri River about 45 miles (72 km) northeast of Helena, Montana, in the United States.[3] The dam, which was built between 1908 and 1918, is 1,364 feet (416 m) long and 124 feet (38 m) high.[1][3] The reservoir formed by the dam, Holter Lake (also known as Holter Reservoir) is 25 miles (40 km) long and has a storage capacity of 243,000 acre feet (300,000,000 m3) of water when full.[4] The dam is a "run-of-the-river" dam because it can generate electricity without needing to store additional water supplies behind the dam
Holter Reservoir
Photo courtesy of Crystal Ash
Special Notices & Closures
Fishing Report for the week of 03/03/2025
Rainbow fishing has been great at the Gates of the Mountains and on the lower end of the reservoir while fishing 6 to 8 feet below the ice with small jigs and maggots or crawler pieces. A few northern pike are being caught at the Gates as well while using set lines with dead baits close to shore. Perch fishing has been hit or miss depending on location. Most anglers have been fishing from the Prairie Dog Town to the Log Gulch area in 30 to 50 feet of water with various jigs tipped with maggots or crawler pieces. The ice along some of the shorelines has melted rapidly with the warm temperatures we¿ve had recently, use extreme caution if heading out onto the ice. There is 7 to 10 inches of ice near the road to the Gates of the Mountains. The ice on the lower end of the reservoir is now extremely variable. Use caution and be careful.
| Size: | 3666.94 acres |
| Elevation: | 3598.16 ft |
| Status of the Fishery: | Holter Reservoir is a popular year-round fishery for rainbow trout, walleye and yellow perch. In addition, kokanee salmon can be targeted primarily in deeper water near the dam. |
| Township/Range/Section: | 14N 3W 27 |
| Latitude/Longitude: | 46.93494 -111.96336 |
| FWP Region: | Region 4 |
| County: | Lewis & Clark |
| Fishing District: | Central |
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| Waterbody | Section | Field Form Type | Date | Purpose | Species |
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To see this data, first select one or more rows from the Collection Info tab.
For Comparative analysis all Length Units are millimeters : all Weights are grams
| Species | Count | Avg | StdDev | Min | Max | AvgWgt | StdDevWgt | MinWeight | S/L | Sects | Surveys | Waterbody |
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To see this data, first select one or more rows from the Collection Info tab.
For Comparative analysis all Length Units are millimeters : all Weights are grams
| Waterbody | Section | Species | Count | AveLength | StdDevLength | MinLength | MaxLength | AveWeight | StdDevWeight | MinWeight | MaxWeight |
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To see this data, first select one or more rows from the Collection Info tab.
For Comparative analysis all Length Units are millimeters : all Weights are grams
| Waterbody | Year | Section | Species | Count | AveLength | StdDevLength | MinLength | MaxLength | AveWeight | StdDevWeight | MinWeight | MaxWeight |
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To see this data, first select one or more rows from the Collection Info tab.
This is a preview, all fields will be visible by selecting a download option. For Comparative analysis all Length Units are millimeters : all Weights are grams.
| Year | Species Abbrv | Length | Weight | M/C | Count | Sex | Mort | Hook Scar | Disease | Scales | Otolith | Fin Clip | Tag | Comment | Genetics | Age | Stomach | Intercept | Slope | Gear | Equipment | Trip | Date | Pass/Run | Water | Section | Lat/Down | Lon/Down | Lat/Up | Lon/Up | Agency | Start Depth | End Depth |
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View the latest Montana Fishing Regulations.
No Gauging Stations found.
This waterbody has a fish consumption advisory. Please see the link for guidelines.
Fish Consumption Guidelines (PDF)
