Black Branch 2

Small headwater stream in rural/agricultural setting near Wilson County, TN. Low flow but appears perennial based on pool presence and channel form. No obvious impairment indicators though riparian buffer is thin in places.

Channel appears largely natural with no visible structural alterations, dikes, or channelization. The channel maintains connection to its floodplain. Minor evidence of lateral instability but the channel form is generally intact. Scoring 7 rather than 10 due to some bank scour and the influence of adjacent pastoral land use that may have historically affected channel form.

Channel shows slight incision with low banks that appear to overtop during moderate storm events. Floodplain connection appears functional based on debris lines and flood deposits visible. No dams or withdrawals apparent. The low bank heights and connected floodplain suggest reasonable flood frequency.

Silt deposition is visible in pool areas as seen in the front and down views. The pool downstream appears to have some fine sediment accumulation on the bottom. Estimated 15-25% of the visible bed is affected by fine sediment deposition, which is moderate for this stream type.

At current low flow, the stream is dominated by slow-shallow conditions with one slow-deep pool visible downstream. The upstream view shows a shallow riffle area but flow is very minimal. Only 2 of 4 velocity-depth regimes are clearly present. Limited fast-water habitat due to low flow conditions.

Water is present but at low levels. The downstream pool is well-filled but the upstream section shows significant exposed substrate. Approximately 50-75% of the channel contains water. Flow appears to be at or slightly below normal baseflow for this stream size.

One riffle area is visible in the upstream direction, and a pool is visible downstream. The visible reach suggests moderate riffle frequency, though the low flow conditions make riffle assessment somewhat difficult. The pool-riffle structure appears present but spacing is wider than ideal.

This appears to be a low-gradient, sinuous headwater stream with gravel/limestone substrate, consistent with an E5 Rosgen type. The channel is slightly entrenched with good floodplain connectivity. The narrow, deep channel form with moderate sinuosity and riffle-pool structure supports this classification. The limestone bedrock influence provides some grade control. The stream flows through a pastoral valley setting typical of Middle Tennessee.

Left bank appears moderately stable with low bank heights. The bank is protected by shrub vegetation and some tree roots in places. However, bare soil is visible in the down view and the bank shows signs of periodic scour. Some root exposure indicates minor erosion processes. Banks are low which limits mass failure risk.

Left bank has moderate vegetative cover from shrubs and grass but coverage is reduced by the dormant season. Bare winter condition makes it difficult to fully assess, but the brushy zone along the left bank appears to provide 50-70% coverage when in full leaf. Currently less protective due to dormancy. Some bare soil patches visible.

Left bank has a brushy riparian zone with dormant shrubs and small trees. Bank heights are low (under 3 ft). Beyond the immediate riparian zone, open field/pasture extends to the south. The buffer appears relatively thin but continuous along this section.

Right bank appears less stable than the left. The front view shows the right bank with exposed soil and less woody vegetation at the bank toe. Grass extends close to the channel edge but provides limited bank stabilization. Some scour evident. Low bank heights limit severity but root protection is minimal at baseflow elevation.

Right bank transitions quickly from sparse tree cover to open mowed/grazed grass field. The immediate bank face has limited woody vegetation cover, with grass being the primary cover. This provides less root stabilization than woody vegetation. Estimated 40-60% effective coverage at the bank face. The mowed field extends close to the channel on the right side.

Right bank is dominated by grass/turf with sparse tree cover. Open field begins within approximately 20-30 feet of the channel. Bank stability is compromised by lack of deep-rooted woody vegetation along the bank face. The mowing/grazing pattern extends relatively close to the stream edge.

Left bank riparian buffer consists of a narrow strip of shrubs and small trees approximately 10-25 feet wide before transitioning to open field/pasture. For a channel approximately 6-8 feet wide, this represents roughly 0.5-1x channel width of natural vegetation. The buffer provides some filtering function but is narrower than ideal.

Right bank has minimal natural riparian buffer. Scattered trees exist but the mowed grass field extends close to the channel edge. Effective woody riparian buffer is less than 10 feet in most of the visible reach. Filtering function is compromised by the proximity of mowed turf and lack of shrub/understory layer.

The floodplain vegetation is significantly altered from natural conditions. The right side is largely mowed grass/turf with scattered trees. The left side has a narrow brushy zone but quickly transitions to open field. Most of the natural shrub and tree understory has been removed or suppressed by mowing/grazing. The floodplain is not in a natural vegetative state.

Currently with bare deciduous trees, shade is minimal. When in full leaf, the scattered trees along the channel would provide approximately 25-50% shade cover. The right bank has less canopy contribution than the left. For a warmwater stream, this provides a moderate mixture of sun and shade conditions, scoring near the middle of the range.

Both banks show inadequate riparian buffers relative to TDEC MS4 30-foot minimum standard. The right bank is more severely compromised with mowed grass extending nearly to the channel edge. Buffer restoration potential is high given the flat terrain and existing scattered trees that could serve as seed sources. This is a priority area for riparian planting and buffer expansion.

Some favorable substrate is present including fallen logs visible in the back view, exposed root wads, and limestone rubble. However, much of the bed appears to be dominated by silt-covered substrate with limited habitat complexity. Approximately 20-35% of visible substrate appears favorable for colonization. The fallen trees provide some habitat but are not yet well-established as colonization substrate.

The downstream pool area shows significant fine sediment covering the substrate. In the upstream riffle area, limestone fragments are partially exposed but surrounded by silt and fine material. Overall embeddedness appears to be in the 50-75% range, with the pool areas being most heavily affected. The low gradient and agricultural land use contribute to fine sediment inputs.

One shallow pool is clearly visible in the downstream direction. The pool appears to be 1-2 feet deep based on the reflectivity and the ability to see some bottom. Pool habitat is present but limited in depth and frequency for this reach. Bottom is partially discernible in the pool, suggesting depths of 1-2 feet.

Four fish cover types are identifiable: fallen logs/woody debris (visible upstream), overhanging vegetation/branches, minor undercut banks, and root mats from streamside trees. Missing are deep pools, boulder/cobble cover, macrophyte beds, and backwater pools. The cover diversity is moderate but quantity of each type is limited.

No barriers to fish movement are visible in any direction from this position. The channel appears to have unimpeded longitudinal connectivity in the visible reach. No culverts, dams, weirs, or perched structures observed.

Several pieces of large woody debris are visible, primarily in the upstream (back) view where fallen trees extend across or into the channel. Approximately 3-7 pieces are visible in the immediate area. No organized debris jams. Some pieces appear freshly fallen (likely storm damage) while others show moderate decay. One large log appears to span the channel upstream.

Three habitat types identifiable: submerged logs (upstream), leaf pack accumulations, and coarse gravel/limestone rubble in the riffle area. The fallen logs appear relatively fresh and may not be fully colonized yet. Fine sediment covering reduces the quality of gravel substrate for invertebrate colonization. Scoring between 3 and 7 given 3 habitat types but with quality limitations.

Cannot directly observe macroinvertebrates from panoramic imagery. Based on available habitat (mixed substrate, some woody debris, pools and riffles), the stream likely supports a moderate invertebrate community dominated by facultative organisms (Group II). The agricultural land use and fine sediment may limit intolerant species. Default score of 6 based on habitat potential.

No actual macroinvertebrates observed in imagery. Score based on habitat assessment suggesting moderate potential for Group II organisms. The limestone substrate and pool-riffle habitat structure could support a moderate invertebrate community. Assessment limited by photographic survey method.

Suitable Habitat: No

The degraded riparian buffer and agricultural land use reduce habitat quality for most species of concern. The limestone substrate and perennial flow could potentially support some native fish species but the small stream size and degraded buffer limit habitat quality.

No wildlife directly observed during this survey point. The early spring dormant condition and mid-day timing may reduce wildlife activity. Brush piles from storm debris could provide small mammal cover. The pool habitat could support fish but none were observed.

Water appears slightly turbid with a brown/tea color, which is typical for streams in this region during early spring. The pool in the front view shows reflections but the bed is partially visible, suggesting clarity of approximately 1-2 feet. No oil sheen, foam, or surface contamination visible. The color appears to be natural tannin/sediment rather than pollution-related.

No visible algal blooms, green coloration, or excessive macrophyte growth. The water is not green-tinged. Some minor algal growth may be present on submerged rocks but is not prominent. Early spring conditions may limit algae growth, but the lack of nutrient enrichment indicators is positive. No dense macrophyte stands observed.

No direct evidence of manure, waste, or livestock access to the stream is visible. The adjacent fields could be used for grazing but no livestock, fencing for livestock exclusion, or manure deposits are visible in the current images. The open pastoral setting suggests potential for livestock access but no current evidence. Scoring 8 rather than 10 due to the pastoral land use context.

This is a warmwater stream with limited canopy shade, especially on the right bank. During summer months, the lack of riparian buffer on the right side will result in direct solar heating of the channel. The scattered trees provide patchy shade but continuous canopy cover is lacking. Riparian buffer restoration would improve thermal conditions. Currently in early spring with bare trees, so current shade assessment represents near-minimum conditions for the year.

No permit compliance concerns observed. Storm damage is natural. The inadequate riparian buffer is a pre-existing condition rather than a recent disturbance.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Difficult to identify invasive species with confidence during dormant season. Some shrubby growth along the left bank could be bush honeysuckle based on growth form, and vine tangles in the brush may include Japanese honeysuckle. Both are common in Middle Tennessee riparian areas. Confidence is low due to bare/dormant conditions. A growing season survey would be needed for accurate invasive species inventory.