Black Branch 2

Small headwater stream in rural residential/agricultural setting showing signs of sediment impairment and habitat degradation from riparian buffer loss and channel incision. Low flow conditions with turbid water and mud substrate suggest ongoing sediment issues.

Channel is natural with no direct structural alteration, but shows moderate incision (estimated 3-6ft below surrounding grade) and evidence of downcutting. The channel is disconnected from its floodplain due to incision, likely exacerbated by adjacent land use changes (mowing to bank edge, loss of riparian buffer). No riprap or channelization, but the incision represents significant departure from reference condition.

Stream appears moderately to deeply incised, with banks 3-6ft high in places. The channel is below the surrounding lawn/pasture level, limiting floodplain connection. Adjacent land use changes (increased impervious surface from residential structures, removal of riparian vegetation) likely contribute to flashier hydrology. Flood frequency access to floodplain is likely reduced to 5-10 year recurrence or greater.

The channel bed appears to be dominated by fine sediment (mud/silt), suggesting significant sediment deposition. Pools appear partially filled with fine sediment. The mud substrate throughout indicates ongoing sedimentation issues, likely from erosion of exposed banks and overland runoff from adjacent mowed areas. Estimated 30-50% of bottom affected by fine sediment deposition.

The visible channel appears dominated by a single flow regime: slow-shallow. Water is barely moving with very shallow depth throughout the visible reach. No riffles, runs, or deep pools were observed. The uniformly low-gradient, mud-bottomed channel provides very limited velocity-depth diversity.

Water is present but at very low levels. The channel appears to have water filling roughly 25-50% of the channel cross-section. Much of the channel bed and lower banks are exposed. Water appears concentrated in the thalweg as shallow pools. Low flow conditions are evident during this dry weather assessment.

No riffles are visible in the reach. The channel is uniformly flat with low gradient and fine substrate. The mud/silt bottom provides no conditions for riffle formation. Flat water dominates entirely in this low-gradient headwater stream.

This small headwater stream has characteristics that could be E-type (low gradient, sinuous, narrow) but the entrenchment and bank erosion suggest possible F-type classification (entrenched meandering with high bank erosion potential). The low gradient, silt/clay substrate, narrow channel, and moderate sinuosity are the key visible features. Confidence is low due to limited visibility of full channel cross-section and planform from the bank perspective. The incision and disconnected floodplain are concerning indicators of geomorphic instability.

The left bank (when facing downstream) has some shrub and brush vegetation providing limited root stabilization, but banks are moderate height (3-6ft) and steep. Active erosion and bare soil are visible in several areas. Some root exposure from overhanging shrubs. The bank is moderately unstable with ongoing scour and undercutting observed in the back view.

Left bank has approximately 50-70% vegetative coverage consisting primarily of dormant shrubs and brush. There are visible patches of bare soil and some areas of root exposure. The dormant season makes assessment challenging, but coverage appears moderate. Some invasive species (likely bush honeysuckle or multiflora rose) may be present in the dense brush thicket but cannot be confirmed in winter dormancy.

Left bank has moderate brush/shrub cover providing some stability but is actively eroding in places. Dense dormant shrub thicket provides some protection but gaps allow ongoing erosion. Agricultural/pasture field visible beyond the brush strip on this bank.

Right bank is more vulnerable than left bank. Mowed lawn extends directly to the bank edge with no riparian vegetation buffer. Bank is moderate height and steep. Very little root protection at the bank face since grass roots provide minimal deep stability. The right bank shows active erosion and is moderately unstable.

Right bank has mowed turf grass extending to the bank edge. While the surface appears covered (~50-70% green coverage due to winter dormancy), the grass provides very limited bank stabilization compared to deeper-rooted shrubs and trees. Mowing to the bank edge represents significant disruption to the natural riparian zone. No woody vegetation providing root structure for bank stability.

Right bank is the more degraded of the two banks. Mowed lawn to bank edge provides essentially no riparian buffer. Grass provides minimal deep root structure for bank stabilization. This bank is a priority for riparian restoration. Adjacent residential structures and outbuildings are within 200ft of the stream.

Left bank has a narrow strip of shrub/brush vegetation estimated at approximately 10-25ft wide. Beyond this, agricultural/pasture field is visible. The buffer is narrow relative to channel width but does provide some filtering function. The channel width is approximately 5-8ft, so the buffer is roughly 1.5-4x channel width, but much of it is dormant shrub with limited filtering capacity.

Right bank has essentially no natural riparian buffer. Mowed lawn extends directly to the bank edge. No woody vegetation, no shrub zone, and no herbaceous buffer zone. The filtering function is severely compromised to non-existent on this bank.

One bank has some shrub/brush vegetation but the right bank is entirely mowed lawn. Most trees and natural vegetation have been removed, particularly on the right bank. The floodplain vegetation is not in a natural state, dominated by managed turf grass on the right and a narrow strip of brush on the left. Ecosystem function is significantly compromised.

Very limited canopy cover over the stream. The UP face shows open sky with minimal tree canopy. Winter dormancy reveals bare branches, but even in full leaf season, the few scattered trees would provide less than 25% shade. The mowed lawn on the right bank ensures no shade from that side. Some shade may come from the left bank shrubs/brush but these are low-growing and provide minimal overstory shade.

Significant non-compliance with TDEC MS4 permit section 4.2.5.4 buffer requirements. The right bank is the highest priority for buffer restoration as it has essentially no natural buffer. The left bank buffer could be expanded to meet the 30ft minimum. Both banks have high restoration potential as the adjacent land appears to be low-intensity use (pasture/lawn) with willing landowner engagement potentially achievable.

Very limited favorable substrate for epifaunal colonization. The channel is dominated by mud/silt substrate which is unstable and provides poor habitat. Some minor undercut banks may provide limited cover. No cobble, boulders, snags, or logs were observed in the channel. Less than 20% of substrate is favorable for colonization.

Channel substrate is dominated by mud/silt with no visible gravel or sand. Some root exposure from overhanging shrubs on the left bank may provide minor root mat habitat, but the bed is overwhelmingly fine sediment. For a low-gradient stream, this represents poor substrate condition.

Some shallow pools are visible but they are very shallow (likely under 6 inches). Pool bottoms are largely discernible through the turbid water in most locations. No deep pools observed. The pools present appear to be formed simply by low points in the channel profile rather than any geomorphic pool-forming mechanism.

Very limited fish cover available. The only cover types observed are minor undercut banks and some overhanging vegetation from the left bank shrubs. No logs, woody debris, deep pools, boulders, cobble, root mats, macrophyte beds, or backwater pools were observed. Only 2 cover types identified.

No barriers to fish movement visible within this reach. However, the very low flow conditions during the survey period may seasonally limit fish movement. The small channel size and shallow depth may also be a seasonal barrier. No culverts, dams, or weirs visible.

Essentially no large woody debris in the channel. A few small branches and leaf litter are present but no significant LWD that would provide habitat or pool-forming function. The lack of LWD is consistent with the absence of mature riparian trees along the right bank and the dominance of shrubs on the left bank.

Very limited invertebrate habitat. Only minor undercut banks and some leaf litter/leaf packs provide potential habitat. The mud substrate is unstable and provides poor attachment points. No cobble, boulders, coarse gravel, submerged logs, or fine woody debris observed in the channel. Substrate is frequently disturbed by sediment deposition and scour.

Score based on expected community given habitat conditions. Mud substrate, low flow, poor habitat diversity, and turbid water all suggest a tolerant-taxa-dominated community. No actual organisms were observed in the imagery, but habitat assessment indicates Group III tolerance would dominate.

No macroinvertebrates directly observed in imagery. Assessment based on habitat conditions. The mud-dominated substrate, lack of riffle habitat, and poor water clarity suggest that tolerant taxa (Group III: midges, aquatic worms) would likely dominate if sampled. The habitat conditions do not support a diverse macroinvertebrate community.

Suitable Habitat: No

The degraded habitat conditions (lack of riparian buffer, turbid water, mud substrate, no riffle habitat, minimal cover) suggest this reach is unlikely to support species of concern. The stream may provide some seasonal use for common species but the habitat quality is poor overall.

No wildlife directly observed during the survey. Winter conditions and time of day may limit observations. The brush thicket on the left bank provides some cover for small mammals and songbirds. The barn visible in the right bank view may provide habitat for barn swallows or other synanthropic species. A dark object near the base of a tree in the back view may be a chicken or other domestic animal but cannot be confirmed.

Water appears brown and turbid throughout the visible reach. Clarity is estimated at 0.5-1ft. No sheen, foam, or algal mats are visible. The brown coloration is likely due to fine sediment suspension and/or tannins from decaying organic matter. No strong odor indicators are apparent from the imagery. Conditions are between marginal and fair.

No visible algae or macrophyte growth in the channel. The winter dormancy period and turbid water make this assessment somewhat limited. The brown water color appears to be sediment-related rather than nutrient-driven. No evidence of excessive nutrient enrichment at the time of the survey, though the adjacent agricultural/residential land uses could contribute nutrients seasonally.

No direct evidence of manure or waste in the stream or on the banks. No livestock are visible, and the mowed lawn suggests residential use rather than active livestock grazing. The agricultural field on the left bank side does not show evidence of livestock access to the stream. However, the adjacent agricultural use could be a potential source of runoff.

Stream receives very limited shade from the sparse riparian vegetation. In summer months with full leaf canopy, some shade may be provided by the left bank shrubs and scattered trees, but the right bank with mowed lawn provides no shade contribution. The open exposure makes this reach vulnerable to thermal stress during summer months. Riparian buffer restoration with tree planting would significantly improve shade conditions and reduce summer temperature extremes.

Mowing to the stream bank edge eliminates the riparian buffer on the right bank, which conflicts with TDEC MS4 permit requirements for riparian buffer protection. While this may be a pre-existing condition on private residential property, it represents a significant stressor to stream health and should be addressed through outreach and voluntary buffer restoration programs.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Winter dormancy makes invasive species identification very difficult. The dense shrub thicket on the left bank contains growth patterns potentially consistent with bush honeysuckle (Lonicera maackii) based on branching structure and density, but positive identification is not possible without leaves or flowers. Japanese honeysuckle vines may be present in the brush but cannot be confirmed. Confidence in all identifications is low due to dormant conditions. A follow-up assessment during growing season (May-August) is recommended for accurate invasive species inventory.