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Miramichi River - Wikipedia, the free encyclopedia

Miramichi River

From Wikipedia, the free encyclopedia

This article is about the river in New Brunswick. For more information about the communities which comprise the Miramichi region, see the separate article on the Miramichi River valley.

The Miramichi River is a Canadian river located in the east-central part of New Brunswick. The river drains into Miramichi Bay in the Gulf of St. Lawrence. The name is a Mi'kmaq word meaning "Goodly River," and it is today the namesake of Miramichi Herald at the Canadian Heraldic Authority.

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[edit] Geography

The Miramichi River watershed drains a territory comprising one-quarter of New Brunswick's territory, measuring approximately 13,000 km² of which 300 km² is an estuarine environment on the inner part of Miramichi Bay. The watershed roughly corresponds to Northumberland County, but also includes sections of Victoria County, Carleton County, and York County and smaller parts of Gloucester County and Sunbury County.

The Miramichi River meander length measures approximately 250 km and is comprised of two important branches, the Southwest Miramichi River and the Northwest Miramichi River, each having their respective tributaries. Tides reach upriver in the Miramichi system to Sunny Corner, NB on the Northwest Miramichi and to Quarryville, NB on the Southwest Miramichi - a distance of approximately 70 km inland from the Gulf of St. Lawrence. The two branches combine at Newcastle, NB where the river becomes navigable to ocean-going vessels.

The estuarine portion of the Miramichi River downriver from Newcastle, NB flows through a drowned river valley. Sea level rise in Miramichi Bay has flooded the mouth of the Miramichi River with saltwater. The estuary comprises the inner portion of Miramichi Bay and is protected from ocean storms in the Gulf of St. Lawrence by barrier islands. The estuary is significant in that it is a highly productive ecosystem, despite its relatively small size. The estuary receives the freshwater discharge from the Miramichi River and its tributaries, mixing with organic materials from the surrounding shorelines and the saltwater inundation from the Gulf of St. Lawrence, itself an estuary and the largest on the planet.

The estuary is a highly dynamic environment, ranging from the high outflows of freshwater during the spring freshet, to the low outflow and rising saltwater content during the summer period, to fall ocean storms and nor'easters which reshape the barrier islands and the old river channel which forms the navigation channel for ocean-going ships heading to ports at Chatham, NB and Newcastle, NB, to the winter covering of sea ice which encases the entire estuary. The inner bay measures only 4 m deep on average, with the navigation channel measuring only 6-10 m, resulting in significant warming of estuarine waters during the summer months. The diurnal tide cycle ranges only 1 m on average.

[edit] Tributaries

Important tributaries include:

Miramichi River

[edit] Geology

Rising in the Silurian and Ordovician rocks of the Miramichi Highlands, an extension of the Appalachian Mountains, the tributaries of the Miramichi River flow eastward into the New Brunswick Lowland, which dominates the eastern and central part of the province along the Gulf of St. Lawrence.

Erosion has created the "Miramichi River valley" (also shortened to just "Miramichi valley"), through which the Northwest and Southwest Miramichi rivers flow. Throughout the course of both branches to Newcastle, NB, they are framed by heavily forested low hills. The highest peak in the Miramichi River watershed is Big Bald Mountain, measuring only 672 m above sea level.

Soils in the Miramichi River watershed are typically acidic with shallow topsoil, lending to poor suitability for agriculture. The shorelines of the estuarine portion of the Miramichi River exposes newer rocks belonging to the Carboniferous era and underlay the sandy topsoil, however some coastal land is low lying and suffers poor drainage. Sandstone rocks are visible along the river banks.

[edit] Fisheries

The Miramichi River and its tributaries originally supported one of the largest populations of Atlantic salmon (Salmo salar) in North America. The Atlantic salmon is an anadromous fish, that is, one that is hatched and grows briefly in freshwater and then migrates to salt water while immature to grow to maturity, before returning to fresh water to spawn and complete their life cycle. The Miramichi River still maintains a reasonably healthy, self-sustaining run of Atlantic salmon, as well as lesser runs of other anadromous fish such as American Shad, smelt, herring and sea-run Brook Trout. About one-half of the sport catch of Atlantic salmon in North America are landed on the Miramichi River and its tributaries currently.

Atlantic salmon fishing is restricted to fly fishing only and all large salmon caught must be released alive to protect the spawning population. Since this fishery is highly regulated, all anglers should contact the New Brunswick Dept. of Natural Resources to obtain the specific rules and regulations for each river and tributary in the Province of New Brunswick prior to fishing, as special licenses, salmon "tags" and permits are required, and certain sections of tributaries and the main river are closed to fishing from time to time to protect salmon brood stocks.

The annual salmon runs start in mid-June and continue through late October, when spawning commences in earnest. It is believed that distinct runs of salmon destined for specific tributaries occur at different times of the year, with those fish headed for the upper reaches of the watershed entering the river earlier than those that spawn in the lower tributaries.

Popular salmon flies on the Miramichi River include the Black Bear series, the Cosseboom series, Butterfly, Oriole, and the Blackville Special. Deerhair flies such as the "Buck Bug" are also successful. Major portions of the Miramichi River salmon fishing waters are controlled by private clubs and outfitters, with "public water" that is available to all very limited. Further, all non-resident anglers must hire a registered guide to fish for Atlantic salmon in New Brunswick. Guides can be inquired for in the village of Doaktown and through Dept. of Natural Resources offices.

[edit] See also

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