Black Branch 2

Small headwater stream in rural agricultural setting showing signs of habitat degradation from lack of riparian buffer, bank erosion, and sediment impairment. Channel is incised and disconnected from floodplain.

The channel appears naturally formed without direct structural alterations, but there is evidence of channel incision and active bank erosion. The stream is downcutting into its floodplain, likely driven by increased runoff from the surrounding agricultural land use and lack of riparian buffer. No riprap or channelization is present, but the active downcutting and lateral cutting warrants a mid-range score.

The channel appears moderately incised with banks approximately 3-6ft high relative to the narrow channel. The stream is likely disconnected from its floodplain for most flow events. The surrounding agricultural land use and mowed yards may contribute to flashier hydrology. Incision level suggests flooding of the adjacent floodplain occurs only during significant events.

The stream bed appears to be silt-dominated with fine sediment throughout. While no distinct point bars or mid-channel bars are visible, the uniform silt substrate suggests chronic sediment loading from the surrounding agricultural land. The lack of defined pools and riffles indicates sediment deposition has homogenized the channel.

The stream appears dominated by a single uniform shallow regime. The low flow conditions and lack of pool-riffle development result in predominantly slow-shallow water throughout the visible channel. No deep pools, fast sections, or riffle features are evident.

Water appears to fill less than half the available channel width. The incised banks rise well above the water surface, and the water appears shallow. Low flow conditions are apparent, though this may partially reflect seasonal conditions (early spring).

No riffles are visible in the reach. The channel appears uniformly flat with no discernible pool-riffle sequence. The silt-dominated substrate and low gradient do not support riffle formation. This is a low-gradient stream where this metric is less applicable, but habitat diversity is still very poor.

This stream appears to be an incised headwater channel (Rosgen Type F or possibly E6 transitioning to F6) with high bank erosion potential. The entrenched condition with silt/clay substrate and moderate sinuosity is consistent with a degraded E-type stream that has incised into an F-type condition. The active bank erosion on both sides and disconnection from floodplain support this classification. The surrounding agricultural land use and loss of riparian buffer likely contribute to the geomorphic instability through increased runoff and loss of bank stabilization.

The left bank (as seen from the LEFT face) has moderate dormant shrub coverage providing some root stabilization, but banks are moderately steep with exposed soil and some undercutting. A few scattered trees including eastern red cedar provide additional stability. Active erosion is present but not catastrophic. Approximately 30-40% of the bank appears protected by roots.

The left bank has approximately 50-70% vegetation coverage, mostly dormant shrubs and some cedars. Bare soil patches are evident, particularly on the bank face. The dormant season makes assessment challenging, but the vegetation density appears moderate. Some of the shrubby growth could include invasive species such as multiflora rose or bush honeysuckle, though identification is uncertain in dormant state.

Left bank has a narrow strip of dormant shrubby vegetation but transitions quickly to agricultural pasture/hay fields beyond. The narrow buffer provides limited protection. Active undercutting and scour evident at bank toe. Moderate 3-6ft bank heights with steep angles.

The right bank (visible in the DOWN and RIGHT faces) has mowed grass extending right to the bank edge with essentially no woody vegetation providing root stabilization below the bank top. The bank is steep and actively eroding. Less than 33% of the eroding surface area is protected by roots. The mowed lawn provides no structural bank protection.

The right bank has mowed grass on top but the bank face itself has less than 50% vegetation coverage. The grass is maintained/mowed right to the edge, disrupting natural riparian vegetation. The bank face shows exposed soil and limited root protection. This represents significant disruption of the natural vegetative protection that would be expected.

Right bank is severely compromised by mowing practices extending grass to the stream edge. No woody riparian vegetation buffer exists. Bank faces show active erosion with steep angles. Residential property with house visible approximately 100-150ft from stream.

The left riparian zone has a narrow strip of shrubby vegetation approximately 10-25ft wide before transitioning to agricultural fields (pasture/hay). For a channel approximately 5-8ft wide, this represents approximately 1-3x channel width, but the vegetation is primarily dormant shrubs without mature trees. The filtering function is compromised by the narrow width and limited vegetation diversity.

The right bank has essentially no natural riparian vegetation. Mowed lawn extends directly to the stream bank edge. The filtering and stabilization functions are severely compromised. There is no regeneration potential as the area is actively maintained as lawn.

Most trees and bushes are gone or limited to a very narrow strip on the left bank. The right bank floodplain is entirely converted to mowed lawn. The left side has some shrubs but lacks mature trees. The vegetation community is not in a natural state due to agricultural and residential land use impacts.

Canopy cover is very limited, estimated at less than 25%. The UP face confirms mostly open sky with only scattered bare branches. A few cedars and deciduous trees provide minimal shade. During leaf-out, canopy may increase slightly but will remain well below 25% given the sparse tree distribution.

Both banks fail to meet TDEC MS4 permit section 4.2.5.4 buffer requirements. The right bank is more severely impacted with active mowing to the bank edge and a residential structure within 150ft. The left bank has some natural regeneration that could be enhanced. Both banks present good restoration potential if mowing practices change and riparian planting is implemented.

The stream has very limited favorable substrate for epifaunal colonization. The bed appears to be predominantly silt/mud with limited stable substrates. Some undercut banks provide minor habitat. No cobble, boulders, or significant woody debris are visible in the channel. Approximately 20-30% of the substrate could be considered favorable, primarily the undercut bank areas and some exposed rock.

The substrate appears to be dominated by mud and silt with the majority of any harder substrates buried. As a low-gradient stream, the applicable criteria focus on substrate mix and root mats. The bed is predominantly mud/clay with some root exposure at banks but minimal root mat development in the channel.

Pool development is extremely limited. The channel appears uniformly shallow with no distinct deep pools visible. The water is shallow enough that the bottom is likely discernible throughout most of the reach. Any pools that exist appear to be very shallow and not providing significant depth refuge.

Only 2-3 cover types are available for fish. Undercut banks provide some cover along eroding sections. Overhanging dormant vegetation (shrubs and tree branches) drapes into the stream in places. Some root exposure at banks provides limited root mat cover. No logs, deep pools, cobble/boulders, or macrophyte beds are visible.

No barriers to fish movement are visible within this reach. However, the very low flow and shallow depth may seasonally limit movement of larger fish. The small channel size naturally limits fish assemblage to small-bodied species.

Large woody debris is essentially absent from the visible channel. A few small branches are visible in the channel, likely recently fallen from the overhanging trees, but no significant LWD contributing to habitat complexity is present. No debris jams, no pool-forming wood, and no channel-spanning pieces are visible. The lack of mature riparian trees severely limits LWD recruitment.

Only 1-2 types of invertebrate habitat are present. Undercut banks provide some habitat, and leaf pack accumulations in the channel offer seasonal habitat. However, the silt-dominated substrate is frequently disturbed by scour and deposition. No cobble, coarse gravel, submerged logs, or stable woody debris are visible. The habitat quality is poor for supporting diverse macroinvertebrate communities.

Habitat conditions suggest a community dominated by tolerant organisms. The silt substrate, poor habitat diversity, and agricultural influences indicate Group III organisms would likely dominate if sampled. No direct observations possible from panoramic imagery.

No macroinvertebrates were directly observed from the panoramic imagery. Assessment is based on habitat quality which suggests the assemblage would be dominated by tolerant taxa (Group III) given the silt-dominated substrate, minimal habitat diversity, and agricultural influences. Score reflects expected community based on habitat conditions rather than direct observation.

Suitable Habitat: No

The degraded habitat conditions (silt substrate, no LWD, minimal riparian buffer, incised channel) provide limited potential for species of concern. No suitable mussel beds, coldwater habitat, or other specialized habitats observed.

No wildlife directly observed in the panoramic imagery. The early spring dormant season and exposed landscape may reduce wildlife activity near the stream. The habitat quality is generally poor for aquatic species due to silt substrate and limited cover, but the area could support common generalist species.

Water appears slightly turbid with a brown coloration, likely from suspended fine sediments. Clarity appears to be approximately 0.5-1ft based on the ability to partially see the bed in shallow areas. No oil sheen, algal mats, or scum are visible. The brown color is consistent with silt-laden water from the surrounding agricultural land use.

No visible algal growth or macrophyte development is apparent in the channel. The brown water color appears to be from suspended sediment rather than algal growth. The early spring dormant season may limit algal productivity. No evidence of nutrient enrichment impacts are visible at this time, though the agricultural setting warrants monitoring.

No direct evidence of manure or waste discharge is visible. No livestock are present and no signs of livestock access to the stream are apparent. The agricultural fields adjacent appear to be hay or pasture but no animals are visible. The farmstead buildings are set back from the stream. Minor score reduction because of the proximity of agricultural operations.

The stream has very limited shade throughout the reach, estimated at less than 25% even during the growing season given the sparse tree distribution. As a warmwater stream in a rural agricultural setting, thermal stress from lack of shade could be a concern during summer months. The lack of riparian canopy allows direct solar radiation to heat the shallow water. No thermal refugia are visible. Riparian buffer restoration with trees would significantly improve thermal conditions.

No acute permit violations observed. However, the chronic lack of riparian buffer on both banks is a long-term management concern for water quality protection.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Confidence is low due to dormant season conditions making species identification very difficult. The dense dormant shrubby vegetation on the left bank has growth patterns potentially consistent with multiflora rose and bush honeysuckle, which are extremely common in Tennessee riparian areas. Japanese honeysuckle vines are also suspected based on vine growth patterns visible on some shrubs and trees. A growing season survey would be needed to confirm species identifications.