| Bremner River | |
| Map Size: | 300 |
| Pushpin Map: | USA Alaska |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of the Bremner River in Alaska |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Alaska |
| Subdivision Type4: | Census Area |
| Subdivision Name4: | Valdez–Cordova |
| Length: | 40miles |
| Source1: | confluence of its north and middle forks |
| Source1 Location: | Chugach Mountains, Wrangell–St. Elias National Park and Preserve |
| Source1 Coordinates: | 60.9781°N -143.8933°W |
| Source1 Elevation: | 651feet[1] |
| Mouth: | Copper River |
| Mouth Location: | 45miles north of Katalla |
| Mouth Coordinates: | 60.845°N -144.5167°W[2] |
| Mouth Elevation: | 174feet |
The Bremner River is a 40miles tributary of the Copper River in the Valdez–Cordova Census Area of the U.S. state of Alaska.[2] It was named in 1885 by Lieutenant H. T. Allen[3] for John Bremner,[4] a prospector who sought gold along the river and was the first non-native person to go there.[5]
Flowing generally southwest from the Chugach Mountains, the Bremner River enters the Copper River 45miles north of Katalla.[4] The North Fork of the Bremner has its headwaters at the Bremner Glacier, which is 8miles long.[4] The entire course of the river lies within Wrangell–St. Elias National Park and Preserve.[6]
The main stem of the Bremner River below the confluence of its north and middle forks is runnable by boaters who are "seasoned Alaska wilderness travelers with advanced to expert boating skills."[7] Rated Class II (medium) to IV (very difficult) on the International Scale of River Difficulty, the river passes through mountainous terrain and dense forests that make for difficult access and troublesome hiking.[7] Other hazards include cold, swift, silty water; isolation; narrow canyons; brown bears, and strong winds near the mouth.[7]