Chimacum Creek

Chimacum Creek is a stream in Jefferson County, Washington, United States. Located on the base of the Quimper Peninsula in the northeast of the larger Olympic Peninsula, it originates from a series of springs and ponds in the forested hills south of Discovery Bay. It flows south from its source before turning east and eventually north, taking in a number of small tributaries before it enters the broad Chimacum Valley, a fertile agricultural region where the stream has been extensively channelized. After taking in its largest tributary, the East Fork Chimacum near the community of Chimacum, it enters a tight ravine where it meets the sea in the community of Port Hadlock-Irondale, creating a small estuary and an area of intertidal wetland as it enters Port Townsend Bay.

The topography of the watershed was shaped heavily by the advance and retreat of the Cordilleran ice sheet during the Last Glacial Maximum, which deposited large amounts of glacial outwash and sedimentary material. The area was the traditional lands of the eponymous Chemakum people, who were devastated by disease and massacres by surrounding groups shortly prior to Euro-American colonization in the 1850s. The watershed was dredged and channelized during the early 20th century, turning the formerly meandering and heavily forested creek into a relatively straight channel through the farms along the valley. Environmental restoration projects in the late 20th and early 21st centuries have helped protect the spawning runs of coho salmon to the creek.

Chimacum Creek is located on the Quimper Peninsula, a small peninsula on the northeastern side of the Olympic Peninsula in western Washington.^[1] The mainstem creek (also known as West Chimacum Creek) originates from a series of springs and ponds in the forested hills to the southwest of the town of Port Hadlock,^[2] and flows for a total of 13.1 miles (21.1 km). The main stem drains from the small Delanty Lake,^[3] flowing first south and then east through the unincorporated community of Center. It then flows northeast through the Center Valley, receiving Barnstorm Creek as a tributary 3.5 miles (5.6 km) from its source. At about 7.7 miles (12.4 km) from its source, it takes in Naylor Creek, which drains nearby Gibbs Lake. About a mile later it takes in another tributary stream, Putaansuu Creek.^[3][4]

In the unincorporated community of Chimacum, the creek receives its largest tributary, the East Fork Chimacum Creek, which produces a little under a fifth of the stream system's total discharge. The 5.5-mile (8.9 km) long East Fork originates about to the southwest in a group of forested wetlands, flowing through Beaver Valley before its confluence with the mainstem. It then flows north for another 2.3 miles (3.7 km) through the community of Port Hadlock-Irondale.^[3] It enters a tight ravine for the last 1.3 miles (2.1 km) of its course, turning east and draining into Port Townsend Bay.^[3][5] A small area of estuary and intertidal wetland is located at the river's embayment into the ocean, on the last 0.2 miles (0.32 km) of its course.^[5]

Chimacum Creek has the largest watershed of the Quimper Peninsula, approximately 33 to 37 square miles (85 to 96 km²),^[1][6] draining the broad Chimacum Valley and an area of surrounding lowland hills.^[7] Both Chimacum Creek and its east fork have a shallow slope.^[1] The valleys of both creeks have thick, poorly-drained soils with large amounts of organic material, allowing for extensive agriculture.^[4] Almost all lowland areas in the valley have been subject to clearing, dredging, and channelization.^[1]

There are five small lakes in the basin—Anderson, Beausite, Delanty, Gibbs, and Peterson.^[1] Wetlands are abundant in the watershed, although many have been lost due to human activities and land modifications. This is especially prevalent in the upland areas of the basin, where large areas of former wetland were converted into agricultural land.^[8]

The watershed lies within the rain shadow of the Olympic Mountains, decreasing annual precipitation.^[1] The southern portions of the basin, near the edge of the rain shadow, receive about 30 inches (76 cm) of rain per year, while the northern portions only receive about 20 inches (51 cm).^[3][4] Summers can be very dry, with less than an inch of rain per month during July and August.^[1] The area has a temperate marine climate, with warm summers and cool winters.^[9]

The embayment at the river's mouth is a long, tidal channel, with areas of tidal marsh historically featuring a spit and a small lagoon. The spit and lagoon were filled in by several acres of added material in the 19th and early 20th centuries, although habitat restoration in 2006 cleared most of this fill material.^[10][11] The delta measures about 5.2 acres (2.1 ha) in area, and now lacks any encroaching roads, jetties, or dikes.^[11]

In 2024–2025, a monitoring station near the mouth of the creek reported a median flow rate of 11.2 cubic feet (320 L) per second. The highest mean flow rate for a single day was in late December, at 189 cubic feet (5,400 L) per second, while the lowest was in late July, at 1.3 cubic feet (37 L) per second.^[12] About 16,405 acre-feet (20,235,000 m³) per year of groundwater recharge occurs in the watershed, while about 9,536 acre-feet (11,762,000 m³) is discharged into the creek or used by residents. The remainder of surplus groundwater recharge likely flows into springs, seeps, and nearby saltwater.^[13]

From about 200,000 years ago, the Cordilleran ice sheet (a large continental ice sheet covering much of North America) made at least six advances and retreats throughout the Puget Lowland. The final of these was the Vashon Stade of the Fraser Glaciation, lasting from around 19,000 to 16,000 years ago during the Last Glacial Maximum. Glacial ice in the region reached a maximum depth of around 4,000 feet. This event heavily disrupted the topography of the region.^[14][15] Much of the topography of the region is covered in narrow, parallel ridges and grooves, typical of glacial fluting.^[9]

Much of the upland portions of the Chimacum basin were covered in diamicton sediment, with particles ranging in size from sand to boulders. The compactness, sorting, and color of this sediment is highly variable. Landforms associated with stagnant glacial ice, such as hummocky terrain and kettles are common in the region.^[16] Some of the highlands are lodgement till, deposits of unsorted glacial sediment which were lodged into the bedrock below during glacial movement.^[17][18] Glacial deposits can reach up to 900 ft (270 m) in some areas of the basin's uplands, overlying formations of sandstone and shale.^[19] Older portions of the western uplands contain material from the Eocene-era Crescent Formation and Lyre Formation, containing various sedimentary rocks alongside portions of volcanic tuff and breccia.^[18]

The floor of the valley consists of expanses of peat (especially along the East Fork) and alluvial deposits, alongside glacial outwash from both the advance and recession of the glaciers during the Vashon Stade.^[9][17][18] This glacial outwash material is highly permeable by water, allowing for high groundwater capacity and groundwater discharge into local rivers.^[20] As the climate warmed during the end of the Vashon Stade, the Puget Lobe of the ice sheet collapsed, and ocean water flooded much of the lowlands it previously covered, beginning the Everson Interstade and depositing marine sediments over portions of the basin. About 12,500 years ago, glacial rebound allowed the local crust to rise again above sea level.^[21]

Nine species of fish are attested in the Chimacum watershed.^[22] Many of these are salmonids who spawn in the creek, including coho and chum salmon, as well as steelhead trout and cutthroat trout.^[5] Stickleback, largemouth bass, western brook lamprey, pumpkinseed, and an unidentified species of minnow are also known to inhabit the creek. Marine species such as starry flounder, surf smelt, pink salmon, and English sole are known to use the estuary.^[22]

Reed canarygrass has become a weed throughout the watershed, especially after livestock were barred access to the creek. Large patches of the plant cause flooding and lower stream flow rates, raising water temperatures. Forest restoration projects were made during the 1980s, planting cottonwood and willows along the banks of the creek to shade out the canarygrass. Formerly removed from the area, beavers were reintroduced to the watershed in the 1960s, and became prevalent after the spread of trees along the creek. About 20 beaver dams have been created in the watershed since the 1990s, creating pools and resulting in the endemic flooding of some areas.^[23]

Prior to colonization, the lower reach of the creek and the Chimacum Valley was a network of forested swamps with many beaver ponds, meandering river channels, and crabapple shrubs.^[24][25] The riparian (riverside) areas of the watershed were covered by conifer forest, with trees such as spruce, cedar, hemlock, and fir.^[25] Some older sources mention patches of prairie in parts of the valley.^[26]

The Chimacum basin was traditionally inhabited by the eponymous Chemakum people, speakers of the Chemakum language, related to the Quileute language of the western Olympic Peninsula. By 1780, there were an estimated 400 members of the group, with many living in a village near the mouth of the creek. They used the name Gsqai to refer to both the village and the Chimacum Valley more generally. The name Chemakum derives from the name their surrounding Coast Salish neighbors gave to them, rendered čə́bqəb in Twana. The group was devastated by diseases and massacres before Euro-American settlement, killing most of the population. Writing in 1855, ethnologist George Gibbs described the Chemakum as a "now almost extinct tribe" living in a village near Port Townsend. He wrote that many had lost their lives in attacks by the Makah and Snohomish many years prior, and that they were later subject to an attack by the Suquamish under the leadership of Chief Seattle around 1848.^[25][27]

Western settlement in the area began during the 1850s.^[28] Port Townsend, on the head of the peninsula, was founded in 1851, while Port Hadlock was founded in 1870. Irondale was founded with the construction of an iron smeltery in 1879, and was platted as a town in 1909.^[29] The Irondale irownworks and adjacent industry deposited large amounts of fill material over the creek's estuary, resulting in the loss of the creek's lagoon and spit. A wooden truss bridge crossed the mouth of the creek.^[10] In 1909, the ironworks opened a steel foundry south of the creek, which soon produced over 700 tons of steel per day, employing around 600 workers. The plant closed in 1911, before briefly reopening in 1917–1919 due to heavy demand for steel during World War I.^[30] The ironworks entered a period of decline during the early 20th century, and the buildings adjacent to the creek were described as dilapidated in a 1915 report.^[10]

Until 1919, Chimacum Creek had not been subject to much modification, still meandering across the valley for much of its course. That year, a drainage district was formed, and a federally-subsidized drainage program channelized both the main and east forks of the stream across their valleys in order to prevent the flooding of adjacent agricultural land. Most farmers in the valley installed drainage tiles to quickly drain wetland areas.^[25][26] The lower portion of the creek became a popular recreation area in the 1930s, referred to under the name Irondale Creek, while the construction of roads and culverts blocked salmon access to many of the small tributary streams. During the early 1940s, additional drainage ditches were dug in the Chimacum Valley using gunpowder explosives, and the meander of the river was further reduced.^[31] Reed canarygrass was introduced during the 1950s.^[32]

By the 1950s, a USDA report noted that the local government had failed to properly maintain the existing drainage infrastructure installed during the 1920s.^[33] The drainage district was inactive between 1968 and 1972, and significant floods broke out in the valley in 1970 and 1971. This led three residents to petition the county superior court to be appointed as the district's commissioners. The board oversaw ditch cleaning in the watershed, using personal funds, federal grants, and a small amounts of remaining funds from before the district's inactivity. Two of the three commissioners resigned following public disclosure reforms in 1974, and the district again fell inactive.^[26] Dredging ceased in the watershed by this time.^[31]

Efforts to restore riparian forest conditions began in the 1980s and 1990s.^[32] Between 1970 and 1995, the Chimacum High School operated a fish hatchery program, releasing juvenile salmon into the creek. In 1979, a faulty hydrant released over 100,000 gallons (378,500 liters) of heavily chlorinated water into the creek, killing most of the 42,350 juvenile coho salmon which had been released into the creek immediately prior.^[34] The summer run of chum salmon ceased to use the creek in the early 1990s, after a culvert failure deposited fine sediment throughout the lower river and cemented a portion of the spawning gravel together, lowering the rates of reproduction. A hatchery program reintroduced summer chum salmon to the river in the late 1990s and early 2000s using stock from Salmon Creek.^[5]

The creek's lower basin is mainly zoned as residential area in the communities of Chimacum, Port Hadlock, and Irondale (collectively referred to as the "Tri-Area"), the densest population center in the watershed. Residential zones in the uplands flank the valley, while a mix of private and publicly-owned forestlands cover much of the upper portion of the watershed.^[5][9] The Chimacum Valley is used for commercial agriculture, among the largest agricultural areas in Jefferson County,^[4][19] with about 3,000 acres (1,200 ha) of farmland in the watershed.^[35] Previously prevalent livestock farming has declined since the 2000s, with smaller farms converted to farms for vegetables, blueberries, and small grains. The last dairy in the valley closed in 2015.^[32]

From the 2000s to the 2020s, large environmental restoration programs were implemented across the creek.^[32] By the early 2000s, much of the land surrounding the last mile of the river's course before its mouth was public ownership, managed by community-owned easements such as the Jefferson Land Trust.^[28] Much of the land in this area was purchased by the Fish and Wildlife Service and Washington Recreation and Conservation Office over the following decade to form the Chimacum Wildlife Area Unit, a 130-acre (53 ha) protected area managed by the Washington Department of Fish and Wildlife as part of the North Olympic Wildlife Area.^[36]