MONTANA RESERVOIR REPORT

Last Updated: December 4, 2025

Montana is home to numerous dams and reservoirs that are crucial for water supply, irrigation, flood control, and recreation. One of the significant reservoirs, Flathead Lake at Polson, MT, typically has an average elevation of the water surface above datum at 2889.51 feet. The latest observed data from December 4, 2025, shows that the current elevation is slightly higher at 2891 feet. This increase suggests that the reservoir is experiencing somewhat above-normal water levels for the time of year, which may be influenced by various factors such as precipitation, snowpack conditions, and river flows feeding into the reservoir.

To understand these abnormal conditions, it's pertinent to cross-reference with multiple data sources. While the specific regional snowfall data from sources like 'kkam.com' for Amarillo or Massachusetts rankings from 'WUPE' do not directly relate to the Montana region, these sources hint at the broader climatic patterns that could affect Montana's water levels. Snowpack levels, particularly in the mountainous regions that feed Montana's rivers and reservoirs, are a critical factor. If areas upstream of Montana experienced higher or lower than average snowfall, this could directly impact the water levels in Montana's reservoirs. Additionally, river flows depend on seasonal temperatures and precipitation patterns. Anomalous weather conditions, such as unseasonably warm temperatures leading to early snowmelt or heavy rainfall events, could contribute to the higher elevation observed at Flathead Lake. Currently, the slightly elevated water level at Flathead Lake suggests that there might be above-average inflow or possibly reduced outflow management, which could be a proactive measure in anticipation of further expected changes in snowpack melting or precipitation. Monitoring these conditions is essential for managing water resources and preparing for potential impacts on the environment and human activities.

Montana has many reservoirs and dams that provide water for irrigation, hydropower, and recreation. Some notable reservoirs include Fort Peck Lake on the Missouri River, Hungry Horse Reservoir on the Flathead River, and Lake Koocanusa on the Kootenai River. These reservoirs receive water from various streams, rivers, and creeks in the surrounding areas, with snowpack and mountain melt contributing significantly to the water supply. The general hydrology of Montana is influenced by its mountainous terrain, with the western part of the state having a wetter climate and the eastern part being more arid. Record levels have been observed in recent years due to heavy snowfall and precipitation, but the state has also experienced drought conditions in some areas. Seasonal trends show that spring and early summer are the wettest times of the year, while late summer and fall are typically drier. Overall, reservoirs and dams play an important role in managing Montana's water resources and supporting various industries and recreational activities.

Montana has many reservoirs and dams that provide water for irrigation, hydropower, and recreation. Some notable reservoirs include Fort Peck Lake on the Missouri River, Hungry Horse Reservoir on the Flathead River, and Lake Koocanusa on the Kootenai River. These reservoirs receive water from various streams, rivers, and creeks in the surrounding areas, with snowpack and mountain melt contributing significantly to the water supply. The general hydrology of Montana is influenced by its mountainous terrain, with the western part of the state having a wetter climate and the eastern part being more arid. Record levels have been observed in recent years due to heavy snowfall and precipitation, but the state has also experienced drought conditions in some areas. Seasonal trends show that spring and early summer are the wettest times of the year, while late summer and fall are typically drier. Overall, reservoirs and dams play an important role in managing Montana's water resources and supporting various industries and recreational activities.