Black Branch 2

Small headwater stream in an agricultural setting with natural bedrock channel. The stream appears to support basic aquatic functions. Low flow conditions limit assessment of full habitat potential.

The channel appears largely natural with bedrock substrate controlling the bed elevation. No evidence of channelization, riprap, or engineered modifications. The bedrock bed prevents significant downcutting. Some minor bank erosion and root exposure observed but consistent with natural processes in a bedrock-controlled channel.

The channel shows slight incision into the bedrock substrate. The left bank (facing downstream) with the adjacent agricultural building/pasture appears to have a relatively low bank that could be overtopped during moderate flood events. The right bank is steeper and higher. Overall, the channel appears to maintain reasonable floodplain connection, particularly on the pasture side.

The bedrock substrate dominates the channel bed with minimal fine sediment deposition visible. Some gravel and fines are present in interstices between bedrock slabs, but the bedrock-controlled nature of the channel limits sediment accumulation. Estimated less than 20% of the bed shows significant deposition.

At current low flow conditions, only shallow regimes are present. The channel is dominated by very shallow flow over bedrock with no deep areas visible. Fast-shallow areas occur over bedrock riffles, and slow-shallow areas occur in minor depressions. No deep habitat is available at current flows.

Water is present but covers only a fraction of the channel bed width. Large areas of bedrock are exposed above the water surface. The stream has water flowing but the channel is only partially wetted, consistent with low-flow/baseflow conditions.

The bedrock channel creates some natural riffle-like features where water flows over bedrock shelves. However, at current low flow, these features are poorly expressed. The channel appears to have moderate riffle frequency controlled by bedrock topography.

This appears to be a small headwater stream with bedrock-controlled channel morphology. The limestone bedrock prevents significant vertical or lateral adjustment. The asymmetric valley cross-section (forested hillside on right, low pasture on left) is characteristic of streams in the Central Basin of Tennessee. Channel classification is tentatively B-type but the small size and bedrock control may place it closer to an A or G type in some classification schemes.

The left bank (facing downstream, toward the barn/pasture) is relatively low with moderate stability. Root systems from sycamore and other trees provide some protection, but the narrow buffer and proximity of agricultural land limit overall bank stability. Some bare soil and root exposure observed. The low bank height reduces the severity of any instability.

The left bank has approximately 50-70% vegetative coverage during the dormant season observed. The narrow buffer between the stream and the agricultural building limits the depth of root zone protection. Some bare soil is visible. During leaf-on season, coverage would likely improve. Native trees present but buffer is thin.

Left bank is lower than right bank with a narrow riparian buffer. Agricultural building approximately 50-75 feet from channel edge. Pasture extends beyond the structure. Buffer is thin but trees are present.

The right bank (facing downstream, forested hillside) is higher and steeper but appears moderately stable. Dense tree root systems on the slope provide structural support. The bank is largely vegetated with leaf litter cover. Some exposed rock at the toe of the slope appears to be natural bedrock outcropping rather than erosion.

The right bank has approximately 70-90% vegetative coverage from dense forest on the hillside. Trees and understory shrubs provide good root protection. Some potential invasive shrubs (possibly privet with green leaves in dormant season). Overall good vegetative protection despite dormant season.

Right bank is a forested hillside with dense deciduous trees and understory. Bank is higher and steeper than left bank but well-vegetated. Some possible invasive shrubs noted (privet-like evergreen foliage in dormant season).

The left riparian buffer is very narrow, estimated at 10-25 feet of woody vegetation between the channel and the agricultural building/pasture. For a channel width of approximately 5 feet, this represents several channel widths but the absolute width is quite narrow. The agricultural building and open pasture immediately beyond the thin tree line severely limits buffer functionality.

The right riparian zone extends up a wooded hillside with what appears to be continuous forest cover extending well beyond 100 feet from the channel. This provides excellent riparian buffer function on this side.

The floodplain is asymmetric. The right side has good forest cover on the hillside. The left side has a very narrow buffer transitioning quickly to agricultural use (barn, pasture). Overall floodplain vegetation is fair - good on one side, compromised on the other.

During the current dormant season, canopy cover is estimated at 25-50% due to bare deciduous trees. During leaf-on season, the canopy would likely provide 50-75% shade. The right bank forest provides most of the canopy, while the left bank has less coverage due to the narrow buffer. Score reflects expected leaf-on conditions.

The agricultural building on the left bank is approximately 50-75 feet from the channel, but the effective woody vegetative buffer is only 10-25 feet. The building appears to be an existing agricultural structure. Buffer restoration potential is moderate - the area between the building and the stream could support additional woody plantings if landowner cooperation is obtained.

The bedrock-dominated substrate provides limited colonization surface compared to a cobble-gravel bed. Some cobble and rubble in interstices of bedrock provide habitat. Root systems of bankside trees and minor undercut banks add some habitat diversity. Estimated 20-40% of substrate is favorable for epifaunal colonization.

Where cobble and gravel are present between bedrock slabs, they show moderate embeddedness with some fine sediment surrounding particles. The bedrock substrate itself is not embedded. Overall embeddedness is moderate for the limited mobile substrate present.

At current low flow, pools are nearly absent. The bedrock substrate creates a relatively uniform channel profile with very shallow water throughout. A small pool is visible in the front view where water collects behind natural bedrock features, but it is very shallow. The entire bottom is discernible throughout the visible reach.

Limited fish cover is available at this location. Some overhanging vegetation from bank trees, minor undercut banks, and root systems provide cover. No deep pools, no significant large woody debris in the channel, minimal boulders protruding into the flow. The bedrock substrate limits habitat complexity.

No barriers to fish movement are visible in the immediate reach. However, the very low flow conditions may seasonally limit fish passage through this section. The shallow bedrock channel could be a natural barrier to larger fish during low flow periods.

A fallen tree is visible spanning the channel in the front view, and some small to medium woody debris is scattered in and near the channel. However, LWD is sparse overall with no significant debris jams. The fallen tree spans the channel but does not appear to be forming pools due to low flow and bedrock bed.

Three types of macroinvertebrate habitat are identifiable: cobble/rubble in bedrock interstices, minor undercut banks at tree root zones, and leaf packs accumulated in low-flow areas. The bedrock-dominated bed limits habitat diversity. No significant LWD colonization platforms or diverse substrate types are present.

Score of 6 assigned based on habitat quality rather than direct observation. The clear water, natural bedrock substrate, and absence of obvious pollutant impacts suggest the stream could support Group II organisms. However, limited habitat diversity and very low flow may limit actual community composition.

No individual macroinvertebrates can be identified from the panoramic imagery. Score based on habitat assessment - the clean bedrock substrate and clear water suggest moderate potential for facultative organisms. The habitat structure is limited but not degraded.

Suitable Habitat: No

The small headwater stream with limited habitat diversity is unlikely to support rare or threatened species. However, the clean bedrock substrate could provide habitat for some specialized aquatic species adapted to karst/limestone environments if flow conditions were more favorable.

No wildlife directly observed during the survey. The large sycamore trees likely have cavities that could serve as nesting/denning sites. The dormant season and human presence (surveyor) may have suppressed wildlife activity.

The water appears very clear where present. The entire bedrock bed is easily visible through the water column. No discoloration, sheen, or film observed. The water is shallow enough that clarity assessment is limited by depth rather than turbidity. Score of 8 rather than 10 due to inability to fully assess at depth.

Water is clear with minimal algal growth visible on the bedrock substrate. Some minor algae or biofilm may be present on rocks (greenish tinge visible on some surfaces) but it is not excessive. No macrophytes visible. The adjacent agricultural land could be a potential nutrient source but no enrichment impacts are currently apparent.

No direct evidence of manure or waste in the stream or on the banks. The adjacent pasture field suggests livestock may be present in the area, but no livestock access to the stream is visible. The agricultural building could be livestock-related but no manure or waste is observed at this location. Fencing may be present but is not clearly visible.

During leaf-on season, canopy shade from riparian trees (particularly the large sycamores) would provide significantly more shade than currently visible. The right bank forest would contribute the most shade. The open pasture on the left limits shade contribution from that side. The very shallow water depth at low flow makes the stream highly susceptible to solar heating during summer months despite available canopy.

No apparent permit violations observed at this location.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Possible privet identified on the right bank slope based on green foliage visible during dormant season (evergreen leaves when surrounding deciduous trees are bare). Some vine tangles in the understory may include Japanese honeysuckle. Bush honeysuckle may also be present. Confidence is low due to dormant season conditions limiting positive identification. Leaf-on season survey recommended for confirmation.