Black Branch 2

Small headwater stream flowing through rural agricultural/pasture landscape. Channel shows signs of degradation from adjacent land use including lack of riparian buffer on right bank, incision, and limited habitat diversity. Likely classified for fish and aquatic life support but showing impairment indicators.

Channel appears natural with no direct structural modifications, but shows moderate incision (3-6 ft bank heights for a stream this small indicate downcutting). The channel is somewhat entrenched relative to the adjacent floodplain pasture. No riprap or channelization observed, but natural geomorphic adjustment is occurring likely in response to land use changes.

The channel shows moderate incision with banks 3-6 feet high for a stream that is only 3-5 feet wide. The adjacent pasture/floodplain appears well above normal flow levels, suggesting the stream has downcut and is partially disconnected from its floodplain. Mowed pasture extending to the bank edge on the right side likely increases flashiness through increased runoff.

Limited sediment deposition observed. The channel bed shows primarily gravel and natural limestone substrate without heavy sediment accumulation. Some fine sediment may be present but the stream is small enough that it is difficult to assess precisely. The slightly turbid water may indicate some sediment transport.

The stream appears to be dominated by shallow flow conditions. Only slow-shallow and fast-shallow regimes appear present based on the low flow and shallow depth observed. No deep pools or deep fast sections visible. The stream lacks the depth diversity needed for higher scores.

Water is present and flowing but does not fill the full channel width. Some exposed substrate is visible along edges. Flow appears low but not critically so for what may be early spring conditions. Approximately 50-75% of the channel bottom appears wetted.

The visible reach appears to be dominated by run habitat with limited riffle-pool development. The low gradient and small channel size limit riffle formation. Some areas of slightly faster flow are visible over exposed rock in the upstream view but distinct riffles are infrequent.

This small headwater stream shows characteristics of a Rosgen F-type channel - entrenched with moderate sinuosity and high bank erosion potential. The channel has likely downcut in response to land use changes (conversion to pasture/agriculture) that increased runoff and reduced riparian vegetation. The incised condition disconnects the stream from its floodplain, concentrating erosive energy within the channel. This is a common condition in Middle Tennessee streams flowing through agricultural landscapes.

The left bank (viewed from the back/upstream image as the right side, and from the left/facing downstream view) has denser shrub and tree vegetation providing some root stabilization. Bank heights are moderate (3-6 ft in some areas) but vegetation density on this side is better. Some erosion and bare soil present but the dense shrub thicket provides a degree of stability. Moderate overall.

The left bank has moderate to good vegetation coverage from dense shrubs and some trees. The dormant-season view shows approximately 70-80% coverage from root structure and persistent woody vegetation, though herbaceous cover is currently dormant. Some bare soil is visible at the bank toe and edge areas. A mix of native shrubs and possibly some invasive species (bush honeysuckle suspected based on growth form) provides cover.

Left bank has better vegetative cover with dense shrub thicket. Bank is moderately incised but root systems provide some stability. Natural limestone outcrops may provide localized bank toe protection.

The right bank is significantly more vulnerable. Mowed pasture grass extends directly to the bank edge with no woody riparian buffer. Bank heights appear moderate to high (3-6 ft) and the steep bank angle with only grass cover provides minimal root stabilization against erosion. Active scour is evident with bare soil exposed along the bank face.

The right bank has only mowed grass extending to the bank edge with no woody riparian vegetation. Approximately 50-60% of the bank face has grass/herbaceous cover, but the root structure of grass alone is insufficient for bank stabilization on steep banks. Bare soil is visible on the bank face. The complete absence of shrub and tree cover on this bank is a significant deficiency.

Right bank is the most impacted. Mowed pasture extends directly to the bank edge with zero woody riparian buffer. This is a significant compliance concern regarding TDEC buffer requirements. Active erosion and bare soil visible on the steep bank face. This bank is a priority for riparian restoration.

The left bank has a narrow but present strip of shrub and tree vegetation. Based on the images, the woody vegetation extends approximately 10-25 feet from the channel before transitioning to open agricultural land. For a 3-5 ft wide stream this equates to roughly 2-5x channel width, but the absolute width is narrow. The shrub thicket provides some buffer function.

The right bank has virtually no woody riparian buffer. Mowed pasture grass extends directly to the bank edge. There may be a few feet of dormant grass between mowing and the bank top, but there is no functional riparian buffer with trees or shrubs on this side. This is well below any standard minimum buffer width.

The floodplain is dominated by mowed pasture on the right bank with only grass cover. The left bank has some shrubs and scattered trees but is narrow. Overall, most natural floodplain vegetation has been removed for agricultural use. The ecosystem is functioning at a reduced capacity for filtering, nutrient processing, and habitat.

Currently in dormant season with bare deciduous canopy, so shade is very limited. Even in full leaf, the right bank has no canopy trees and the left bank has only scattered trees. Estimated summer canopy cover would be approximately 20-30% at best, concentrated on the left bank. The stream is largely exposed to direct sunlight.

This is a significant buffer compliance concern. The right bank has no functional riparian buffer, with mowed pasture extending directly to the bank edge. The left bank has some natural vegetation but it is narrow and does not meet the 30 ft minimum. Riparian restoration on both banks, particularly the right bank, should be a high priority. The flat, accessible terrain of the right bank floodplain makes restoration feasible with high potential for success.

Limited favorable substrate for macroinvertebrate colonization. The channel has some natural rock/gravel substrate and minimal woody debris. Most habitat is limited to the natural rock exposures. Very few logs, snags, or other complex substrate features visible. Estimated 20-30% favorable substrate.

The substrate appears to be a mix of gravel, some limestone fragments, and fine sediment. The back/upstream view shows a gravel/rock bed with some fine sediment. Embeddedness appears moderate with some interstitial spaces still available but fine sediment partially filling gaps between coarser particles.

The stream is very shallow throughout the visible reach with the entire bottom discernible. No deep pools were observed. The low flow conditions and small channel size limit pool development. At best, there may be very shallow pools but no significant depth diversity.

Limited fish cover available. Some overhanging vegetation from the left bank shrubs, minor root exposure, and some shallow riffle/run habitat over rocky substrate. No deep pools, no significant woody debris, no undercut banks, and very limited cover overall. Only 2-3 cover types available.

No artificial barriers to fish movement were observed within the visible reach. However, the very low flow conditions during dry periods may seasonally inhibit fish movement in this headwater stream. No culverts, dams, or weirs visible.

Very little large woody debris observed in the channel. The small stream size and limited riparian tree cover (especially on the right bank) results in minimal LWD recruitment. Only minor small twigs and leaf litter observed. No debris jams or pool-forming wood present.

Limited invertebrate habitat diversity. The stream provides coarse gravel substrate and some leaf pack accumulation as primary habitat types. The lack of large woody debris, limited cobble/boulder habitat, minimal undercut banks, and absence of diverse substrate conditions result in only 1-2 viable habitat types for macroinvertebrate colonization.

Score assigned at Group II level based on habitat quality assessment rather than direct observation. The limited but present gravel habitat and flowing water suggest the stream could support some facultative organisms, but the poor habitat diversity and limited riparian cover would likely exclude most sensitive (Group I) taxa.

No individual macroinvertebrates were directly observed in the imagery. Score is based on habitat assessment only - the available habitat would likely support some Group II (facultative) organisms. The gravel substrate and flowing water suggest conditions could support some crayfish, damselflies, and blackflies. Actual sampling would be needed to confirm.

Suitable Habitat: No

The degraded habitat conditions, small stream size, and limited riparian cover reduce the likelihood of supporting species of concern. The stream may support common warm-water fish species and generalist macroinvertebrates but lacks the habitat complexity for sensitive species.

No wildlife was directly observed during this capture. The dormant season and presence of a human technician may have reduced observable activity. The shrub thicket on the left bank could provide some songbird habitat. The open pasture provides limited wildlife value.

Water appears slightly turbid with a brownish tint but the bed is visible through the shallow water. Clarity appears reasonable for a small pasture stream during dry weather conditions. No oil sheen, foam, or film observed. The slight turbidity may be natural for this substrate type.

No significant algal growth or macrophyte proliferation observed. Water does not appear green. Some minor algal growth may be present on rocks but not visible at this resolution. The dormant season and low water temperatures would limit algal growth. No evidence of severe nutrient enrichment, though adjacent pasture land use may contribute nutrients.

No direct evidence of manure or livestock waste observed in or near the stream. However, the adjacent pasture land could potentially be used for livestock grazing. No livestock, fencing to exclude livestock, or manure deposits are visible in the images. The mowed grass condition suggests the area may be maintained as lawn rather than active pasture.

The stream is largely unshaded due to bare deciduous canopy (dormant season) and absence of riparian trees on the right bank. Even in full leaf, shade coverage would be limited to partial shading from left bank trees only. The open pasture setting and south-facing exposure (based on sun angle) would contribute to summer warming. Riparian tree planting on both banks would significantly improve shade and thermal conditions. No thermal refugia observed.

The absence of a riparian buffer on the right bank, with mowed grass extending to the channel edge, is a potential concern under TDEC MS4 permit requirements for riparian buffer protection. Additionally, the stream's degraded habitat condition may indicate broader watershed-level impacts from agricultural land use.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Other Invasive Species

Dormant season conditions make definitive invasive species identification difficult. The dense shrub thicket on the left bank has a growth form consistent with bush honeysuckle (Amur or Morrow's honeysuckle) based on the dense branching pattern and persistence of some small leaves in early spring, though confidence is low. Some Japanese honeysuckle vine is suspected in the understory. A growing season survey would be needed for definitive identification. Eastern red cedar is present along the stream corridor.