| Lost Creek | |
| Pushpin Map: | British Columbia |
| Pushpin Map Caption: | Mouth of Lost Creek |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | British Columbia |
| Subdivision Type3: | District |
| Subdivision Name3: | Cassiar Land District |
| Length: | 26km (16miles) |
| Discharge1 Avg: | 1.07m3/s |
| Source1: | Level Mountain |
| Source1 Location: | Nahlin Plateau |
| Source1 Coordinates: | 58.5522°N -131.4153°W[1] |
| Source1 Elevation: | 1687m (5,535feet) |
| Mouth: | Koshin River |
| Mouth Coordinates: | 58.6647°N -131.7031°W |
| Mouth Elevation: | 937m (3,074feet)[2] |
| Basin Size: | 70km2, |
| Custom Label: | Topo map |
Lost Creek is a tributary of the Koshin River in northwest part of the province of British Columbia, Canada.[3] It flows generally northwest for roughly 26km (16miles)[4] to join the Koshin River just north of Hatin Lake, and about 4km (02miles) north of Callison Ranch. Lost Creek's watershed covers 70km2, and its mean annual discharge is estimated at 1.07m3/s.[5] The mouth of Lost Creek is located about 90km (60miles) north of Telegraph Creek, British Columbia, about 102km (63miles) west of Dease Lake, British Columbia, and about 163km (101miles) east of Juneau, Alaska. Lost Creek's watershed's land cover is classified as 46.3% shrubland, 31.5% conifer forest, 12.2% barren, and small amounts of other cover.[5]
Lost Creek is in the traditional territory of the Tlingit Taku River Tlingit First Nation[6] [7] and the Tahltan First Nation, of the Tahltan people.[8]
Lost Creek originates on the north side of the massive Level Mountain shield volcano, near the headwaters of Kaha Creek and Matsatu Creek, about 8km (05miles) north of Meszah Peak, the highest peak of the Level Mountain Range, a cluster of bare peaks on the summit of Level Mountain. The creek flows north and northwest, first through Level Mountain's high and relatively barren lava plateau, then through rugged forested terrain. In its final 2km (01miles) Lost Creek enters the Koshin River's floodplain. It empties into the Koshin River in the wetlands along the river north of Hatin Lake. The historic Yukon Telegraph Trail, following the Koshin River, crosses Lost Creek near its mouth.[9] [10]